Cod liver oil × PCR-confirmed SARS-CoV-2 — Null coprimary outcome, testing and applicability gaps

Required evidence, verification status and materials actually read
Item	AVerification status	BReading scope	CReview item	DCurrent findings	EWhy unverified	FRequired materials and conditions	GFurther research
1	Partly verified	Full text not readStored summary read	N01 · Evidence conditionWhich existing PCR-infection claim is being presented?Required	The selected claim is reduced PCR-confirmed SARS-CoV-2 infection. Its original subclaim grade is D and its note records a null result, RR 1.00 (CI 0.82–1.22). Missing subclaim score/status/axes are distinguished from the parent D with 34 points and its axes. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	Selected wording, subclaim grade and parent context	Materials needed: PCR-infection definition, population/exposure, prespecified endpoint/estimand, period/denominator and existing question-boundary review. Parent values are not used to fill missing subclaim fields. Only the material request/research need is recorded; no lookup or research is performed now.
2	Partly verified	Full text not readStored summary read	N02 · Evidence conditionWhich adults were studied during winter?Required	The original population was 34,601 Norwegian adults not taking vitamin D supplements daily. Exact age range, baseline vitamin D status/deficiency, conditions, testing/vaccination and concomitant exposures are not established from the summary. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	Norwegian adults not taking vitamin D daily	Materials needed: Eligibility/exclusions, baseline vitamin D/health, vaccination/infection history and actual exposure/behaviour/medication data. Do not extend to deficient patients or populations in every period. Only the material request/research need is recorded; no lookup or research is performed now.
3	Partly verified	Full text not readStored summary read	N03 · Evidence conditionWhat is known about winter, the period and duration?Required	The original materials record about six winter months, a median 164 days of use, registration posted 2020-10-30 and start 2020-11-10. Actual end/individual follow-up and variant/vaccination/testing-policy details remain unverified. No new end date or observation time is calculated. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	About six winter months, a median 164 days and the stated start	Materials needed: Actual recruitment/exposure/follow-up dates, season/variant/vaccination/testing policies and discontinuation/loss data. Do not turn this into current COVID-19 or other-period prevention guidance. Only the material request/research need is recorded; no lookup or research is performed now.
4	Partly verified	Full text not readStored summary read	N04 · Evidence conditionWas the study product vitamin D or omega-3 alone?Required	The original study used cod liver oil 5 mL/day, supplying vitamin D 10 µg and about 1 g of n-3 fatty acids. This was a combination product; it does not extend to deficiency treatment, high-dose vitamin D or omega-3 alone. No new total ingredient amounts or other vitamin values are created. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	Möller's Tran combination cod liver oil	Materials needed: Exact product/composition/manufacture, actual intake/adherence and concomitant supplement source data. No cod-liver-oil/vitamin/product-use or treatment-replacement instructions. Only the material request/research need is recorded; no lookup or research is performed now.
5	Partly verified	Full text not readStored summary read	N05 · Evidence conditionIs the flavour-matched corn-oil comparator preserved?Required	The original 34,601 adults were assigned to cod liver oil, 17,278, or flavour-matched corn-oil placebo, 17,323. Actual placebo composition, sensory features/masking, other supplements/diet and concomitant exposures remain unverified. Do not substitute no intervention or a different oil product. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	17,278 assigned cod liver oil versus 17,323 assigned corn oil	Materials needed: Actual active/placebo products, contact/sensory features, concomitant intake, adherence and exposure data. Do not generalize this particular comparison to all cod-liver-oil/vitamin effects. Only the material request/research need is recorded; no lookup or research is performed now.
6	Partly verified	Full text not readStored summary read	N06 · Evidence conditionAre a median 164 days and complete observation/adherence distinguished?Required	The original duration of use was a median 164 days. This does not mean identical duration/exposure or complete adherence for everyone. Distributions, discontinuation/withdrawal and observation by time remain unverified; cumulative amounts/person-time are not calculated. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	Duration distribution and actual exposure/discontinuation	Materials needed: Actual exposure/adherence, discontinuation, follow-up distributions by arm and endpoint-specific observation periods/missing data. No product-use or COVID-19 management guidance. Only the material request/research need is recorded; no lookup or research is performed now.
7	Partly verified	Full text not readStored summary read	N07 · Evidence conditionWhat were the original PCR-infection events and effect?Required	Selected PCR infection was null: 227 versus 228, RR 1.00 (adjusted 95% CI 0.82–1.22). No new proportions, risk differences, NNT or P values are calculated from randomized arm sizes; no new verdict of exactly zero effect, equivalence or exclusion of every benefit is made. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	227 versus 228, RR 1.00 and adjusted 95% CI	Materials needed: Original PCR events/denominators, estimand/test, adjusted interval/plan and clinical threshold. No new calculations or invented examples beyond the original effect/CI. Only the material request/research need is recorded; no lookup or research is performed now.
8	Partly verified	Full text not readStored summary read	N08 · Evidence conditionWhat is the exact event unit for a positive PCR result?Required	The original endpoint was PCR-confirmed SARS-CoV-2 infection with 227/228 events. Positive tests, people with a first infection, repeated infections/tests, specimens and confirmation rules remain unverified. Tests/repeated time points are not added as new participants/events. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	Confirmed infection, people/tests and repeated events	Materials needed: Original test/event definitions, person identifiers, first/repeated positives, baseline infection/diagnosis and aggregation/timing data. No new unique-infection or test totals. Only the material request/research need is recorded; no lookup or research is performed now.
9	Unverified	Full text not readStored summary read	N09 · Evidence conditionHow do testing selection and opportunities affect the comparison?Required	The original materials record PCR-confirmed infection and negative SARS-CoV-2 tests as separate coprimary outcomes. Testing selection, frequency, access, omissions, asymptomatic testing and opportunities/behaviour by arm are not established from the summary. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	Detailed gaps in access, symptoms/screening and missed testing	Materials needed: Testing/selection criteria, policies/access, opportunities in both arms, missingness/confirmation and prespecified analysis/sensitivity data. Do not repurpose negative tests as absence of infection or a prevention effect. Only the material request/research need is recorded; no lookup or research is performed now.
10	Partly verified	Full text not readStored summary read	N10 · Evidence conditionAre ITT for 34,601 adults and endpoint-specific observation denominators separated?Required	All original 34,601 randomized adults were included in ITT; missingness in key variables was 0.05%. This does not establish identical denominators for all PCR observations/tests/analyses or zero missingness in every variable. Actual missing/observed/censored counts remain unverified. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	All randomized adults in ITT and the scope of 0.05% missingness	Materials needed: Original participant flow by arm, PCR observation/analysis/testing denominators, missing variables/handling and duration/withdrawal/censoring data. No new missing counts/rates or confirmation that everyone completed follow-up. Only the material request/research need is recorded; no lookup or research is performed now.
11	Partly verified	Full text not readStored summary read	N11 · Evidence conditionAre the four coprimary outcomes and multiplicity plan preserved?Required	The original materials record four prespecified coprimary outcomes—PCR infection, serious COVID-19, negative tests and self-reported ARI—and fallback multiplicity control. Plan details, allocation and decision rules were not confirmed through new registration/SAP reading. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	Prespecified fallback, adjusted intervals and null outcomes	Materials needed: Exact endpoints, fallback procedure/intervals/significance levels, amendments/hierarchy in registration/protocol/SAP and original results. No new adjusted P values, calculations or grades. Only the material request/research need is recorded; no lookup or research is performed now.
12	Partly verified	Full text not readStored summary read	N12 · Evidence conditionIs serious COVID-19 distinguished from the overall PCR-infection effect?Required	Original serious COVID-19 was null: 121 versus 101, RR 1.20 (CI 0.87–1.65). The exact serious-outcome definition, overlap/denominators and model remain unverified; PCR numerators 227/228 or RR 1.00 are not copied here. No new verdict of a confirmed risk increase is made. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	121 versus 101, RR 1.20 and CI 0.87–1.65	Materials needed: Serious-outcome definition, relation to test-confirmed infection, denominators/timing/follow-up, original effect/CI and aggregation data. No new clinical components/event totals or effects. Only the material request/research need is recorded; no lookup or research is performed now.
13	Partly verified	Full text not readStored summary read	N13 · Evidence conditionDoes a negative test independently establish infection prevention?Required	Original negative SARS-CoV-2 tests were null: 8,546 versus 8,565, RR 1.00 (CI 0.97–1.04). Testing selection/negative-event definition and person/test overlap remain unverified. Do not repurpose this as people with negative PCR/no infection or a reduction in all infection incidence. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	8,546 versus 8,565, RR 1.00 and CI 0.97–1.04	Materials needed: Negative-test definition, aggregation/repetition, denominators, testing opportunities, prespecified model and original results. Positives/negatives are not summed into new test totals or unique people. Only the material request/research need is recorded; no lookup or research is performed now.
14	Partly verified	Full text not readStored summary read	N14 · Evidence conditionIs self-reported ARI confirmed SARS-CoV-2 infection?Required	Original self-reported acute respiratory infection was null: 3,964 versus 3,834, RR 1.04 (CI 0.97–1.11). Questionnaire/period/definition, other pathogens and test-confirmation details remain unverified. Do not combine this with PCR-confirmed infection/serious events. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	3,964 versus 3,834, RR 1.04 and CI 0.97–1.11	Materials needed: Original ARI questions/definition, people/repeated symptoms, actual testing/timing, denominators/model. Do not upgrade self-reports to pathogen-confirmed infection. Only the material request/research need is recorded; no lookup or research is performed now.
15	Partly verified	Full text not readStored summary read	N15 · Evidence conditionWere coprimary outcomes or repeated tests in the same people added together?Required	Original event counts for all four endpoints are preserved separately. The overlap between PCR/serious outcomes/negative tests/ARI and repeated time points in the same people remains unverified. Events/denominators are not added into new participant counts, independent trials or infection totals. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	Endpoint/event overlap and unique people	Materials needed: Person/test/event identifiers, overlap/repetition handling and endpoint-specific denominator/observation data. Overall unique-trial/participant totals remain unrecorded. Only the material request/research need is recorded; no lookup or research is performed now.
16	Partly verified	Full text not readStored summary read	N16 · Evidence conditionWere between-arm estimates replaced by within-arm changes?Required	Original effects are endpoint-specific randomized between-arm RRs/intervals. Individual/within-arm changes in infection exposure, testing behaviour and model adjustment remain unverified. Changes across periods within an arm are not newly calculated as product-specific effects. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	Randomized between-arm RRs and exposure/testing changes	Materials needed: Original estimand/denominators, between-arm model, period/testing/concomitant exposures and variable/missing-data handling. No new differences, ratios or time-series effects. Only the material request/research need is recorded; no lookup or research is performed now.
17	Partly verified	Full text not readStored summary read	N17 · Evidence conditionWere original allocation and masking descriptions treated as certification?Required	Original materials record allocation by the hospital research-support department without investigator involvement, and masking of participants, investigators, care providers, collectors, assessors and analysts. The original term quadruple-blinded and parent B0 are retained; no new procedural comparison or formal risk-of-bias assessment was performed. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	Independent research-support allocation and masked roles	Materials needed: Actual concealment/implementation, masking success/unmasking, exposure/deviations and measurement/missing-data source materials. Design strengths and manufacturer support are recorded separately. Only the material request/research need is recorded; no lookup or research is performed now.
18	Partly verified	Full text not readStored summary read	N18 · Evidence conditionWas the CI range or null result extended into a clinical-threshold conclusion?Required	Original PCR RR 1.00 (CI 0.82–1.22) and subclaim grade D are preserved. No new confirmation is made of a prespecified clinical threshold, exclusion of every benefit, equivalence, high-dose single-ingredient effects or deficiency treatment. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	PCR RR/adjusted CI and unverified clinical importance	Materials needed: Original estimand, adjusted CI/plan, clinical threshold, scope and question-specific direct materials. No new precision/efficacy verdict based only on sample size. Only the material request/research need is recorded; no lookup or research is performed now.
19	Partly verified	Full text not readStored summary read	N19 · Evidence conditionWas the result generalized to current prevention or other ingredients?Required	The existing counterview/ad interpretation limits scope to about six winter months of combination cod liver oil in adults not taking vitamin D daily. It does not address deficiency treatment, high-dose vitamin D or omega-3 alone. Do not turn it into current COVID-19 prevention/management or treatment-replacement instructions. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	Combination-product, period and population boundaries	Materials needed: Direct population/period/ingredient/dose, intervention/comparator, PCR/clinical endpoint, duration/effect/CI and harm materials. No recommendations or intake guidance. Only the material request/research need is recorded; no lookup or research is performed now.
20	Partly verified	Full text not readStored summary read	N20 · Harm-information gaps supplementing the efficacy tableWhat is the scope of the low-grade side-effect description?Supplementary	The existing safety description records only low-grade side effects in both arms and limits scope to the tested dose/participants. Event types/counts by arm, actual exposure/denominators, discontinuation and causality remain unverified. Do not extend to zero adverse events or long-term safety. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	Reports in both arms and tested dose/population safety	Materials needed: Adverse-event collection/grading, events/exposure/harm denominators by arm, discontinuation/causality and long-term materials. No cod-liver-oil/vitamin/infection-management instructions. Only the material request/research need is recorded; no lookup or research is performed now.
21	Partly verified	Full text not readStored summary read	N21 · Evidence conditionWhat materials were actually read or acquired?Required	The complete parent summary was read for production and preserved in its original form. Summary reading concerns preserved materials; external abstracts/full texts/registrations/protocols/SAP remain unread. Original citations/URLs do not establish external reading here. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	Preserved summary and external original materials	Materials needed: Records of actual acquisition/reading scope, versions and dates. No external-link/click/access testing. Only material requests/research needs are recorded; no search or research was performed in that production.
22	Partly verified	Full text not readStored summary read	N22 · Evidence conditionAre historical registration/plans distinguished from current reading?Required	Existing evidence/Korean text records NCT04609423, posted 2020-10-30 before the 2020-11-10 start, as prospective registration with four matching coprimary endpoints. Official registration URL/version/plan were not newly compared externally; URLs are not guessed. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	Original registration identifier and detailed comparison	Materials needed: Actual registration versions/publication, recruitment/start/amendments, endpoints/models/analysis intervals and original report links. Preserve historical descriptions without new certification of plans or prospective specification. Only the material request/research need is recorded; no lookup or research is performed now.
23	Unverified	Full text not readStored summary read	N23 · Evidence conditionHave protocol/SAP and analysis/missing-data plans been acquired?Required	Original primary-outcome/ITT/registration descriptions and historical cross-checking are preserved. Actual protocol/SAP versions/timing, interval/endpoint-specific models/censoring/missingness and hierarchy/multiplicity were not newly read. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	Separate materials for prespecified plans/changes	Materials needed: Protocol, SAP, amendments, estimands/denominators/analyses, all endpoints and publication timing. Unread materials are not assumed absent. Only the material request/research need is recorded; no lookup or research is performed now.
24	Partly verified	Full text not readStored summary read	N24 · Evidence conditionAre sponsorship, funding, products, authors and research involvement separated?Required	Orkla Health AS funding and cod-liver-oil/placebo supply, plus Oslo University Hospital/University of Oslo support, are preserved. Outside relationships of KBH with Olympic Seafood/Amgen/Sanofi and SMU with Olympic Seafood, and AS/KTK employment at Age Laboratories AS, are separately recorded. Do not confuse these with newly confirmed product-manufacturer employee authors or design/analysis roles. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	Four company-involvement items and nonprofit/public/academic support	Materials needed: Separate original materials on company cash funding, product support, employee authors/outside relationships, design/analysis/data control and nonprofit/institutional support. Original independence-axis values are not new certification of all items or independence. Only the material request/research need is recorded; no lookup or research is performed now.
25	Partly verified	Full text not readStored summary read	N25 · Evidence conditionAre results by interval/endpoint distinguished from information gaps?Required	Null findings for PCR infection, serious outcomes, negative tests and self-reported ARI are distinguished from unverified event definitions/testing opportunities/denominators and unread details. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	Direct results, unverified details and access status	Materials needed: Direct measurements, original interval/endpoint tables, plans, observations/denominators and actual access records. Do not substitute unread with unreported or null with exactly zero effect/equivalence. Only the material request/research need is recorded; no lookup or research is performed now.
26	Partly verified	Full text not readStored summary read	N26 · Evidence conditionAre reports, trials, people, intervals, events and related sheets separated?Required	Parent 2972 and existing s0/s1/s2 share the same Brunvoll 2022 report, trial of 34,601 people and four-coprimary-outcome context. The same people/arms/periods/tests/events/endpoints, citations, related sheets are not added as new independent trials or participants. Linked-report counts do not certify unique-trial/participant totals. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	Linked records versus unique trials/participants	Materials needed: Original reports/registration, cohorts/intervals, events/repetition/observation and overlap relationships. Unique-trial/participant totals remain unrecorded. Only the material request/research need is recorded; no lookup or research is performed now.
27	Unverified	Full text not readStored summary read	N27 · Evidence conditionAre the original single trial and separate independent replication distinguished?Supplementary	Parent R1/I0 are preserved. Intervals/endpoints/related sheets for the same participants are not certified as new independent replication; researcher relationships and manufacturer support remain separately recorded. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	Parent R1, independence axis and direct replication	Materials needed: Separate prespecified confirmation matching the question, with direct population/intervention/comparator/endpoint/duration, denominators/effects/CI and funding/author relationships. No new search or independence verdict. Only the material request/research need is recorded; no lookup or research is performed now.
28	Partly verified	Full text not readStored summary read	N28 · Evidence conditionAre the subclaim grade and parent score/axes preserved?Required	The selected grade/note and bilingual question are preserved; absent subclaim score/status/axes remain unrecorded. Parent D with 34 points, safety and axes remain parent context. They are not repurposed as the selected score and no new grade/RoB2/GRADE certification is created. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	Selected D, missing score/status/axes and parent context	Materials needed: Existing subclaim/parent-boundary review and actual correction materials. Distinguish absent/original axis values and their history. Only the material request/research need is recorded; no lookup or research is performed now.
29	Partly verified	Full text not readStored summary read	N29 · Evidence conditionAre both languages, citations and absent fields preserved?Required	Preserve parent Korean/English citations/descriptions, evidence/citation lists, axes and selected-subclaim records in the complete summary. Separate classification information in both languages is absent; originals are not filled with new fields. No external English full-text comparison. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	Both original languages and absent separate classification information	Materials needed: Materials for reviewing bilingual terminology, time/event/effect units, selected scope and absent fields. Production explanations are distinguished from original records. Only the material request/research need is recorded; no lookup or research is performed now.
30	Partly verified	Full text not readStored summary read	N30 · Evidence conditionAre source dates/corrections/history separated from production dates?Required	Original evidence date 2026-08-26, empty corrections/deliberation and grade-decision cross-checking are preserved. Historical citation/registration descriptions differ from current production, condition freezing/application and completed content review. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	Original 2026-08-26 and new conditions/application	Materials needed: Update materials separating originals, events, conditions/observations and verdict decisions when new evidence/corrections arise. Historical wording is not completed clinical content review here. Only material requests/research needs are recorded; no search or research was performed in that production.
31	Unverified	Full text not readStored summary read	N31 · Evidence conditionWhat direct materials would fill the selected gaps?Supplementary	PCR-infection accuracy/applicability could be clarified by direct testing selection/definition, endpoint denominator/model, adjustment-plan and winter/period/baseline-state materials. Do not extend to other-ingredient treatment or broad prevention. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	Direct interval/endpoint effects, denominators/CI and follow-up	Materials needed: Original tables/plans, interval/endpoint definitions, estimands/CI, observation/censoring/denominators, exposure/adherence, independent confirmation and long-term harms. Only the need is recorded; no new lookup/research. Only the material request/research need is recorded; no lookup or research is performed now.
32	Partly verified	Full text not readStored summary read	N32 · Evidence conditionAre applicability records separated from content review and instructions?Supplementary	These are summary-based applicability records. Existing content/question-boundary review remains incomplete; candidate pending/eligible markers are preserved as history. R01	Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.	Applicability records, existing candidate history and content review	Materials needed: Existing content review and later actual materials/corrections. The original production did not perform clinical-source comparisons, external access, new calculations, grade changes or product-use/COVID-19 management/infection-prevention/treatment-replacement instructions. Only the material request/research need is recorded; no lookup or research is performed now.

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32 itemsWhat the statuses mean

Assessment scope

Stored-material review date: Not recorded
Original evidence cut-off: 2026-08-26
Scope actually checked: Existing review summaries and stored records of methodological application. Full papers, supplements, registrations, plans and original data were not read.
What the dates mean: This is the date the stored materials were checked, not the date of a new search of the clinical literature.
Population: 34,601 Norwegian adults not taking vitamin D supplements daily, 17,278/17,323; baseline vitamin D/age and PCR observation/testing-denominator details unverified
Ingredient, formulation and route: Orkla Health AS Möller's Tran combination cod-liver-oil study product
Dose: Original study exposure: 5 mL/day, vitamin D 10 µg, about 1 g n-3 and a median 164 days; no new cumulative amount or product/vitamin intake guidance
Comparator: Flavour-matched corn-oil placebo, 17,323 adults; actual composition/concomitant exposures unverified
Measured outcome: Selected PCR-confirmed SARS-CoV-2 infection; separated from the other coprimary serious-outcome/negative-test/self-reported-ARI endpoints
Duration: About six winter months, a median 164 days; original registration posted 2020-10-30/start 2020-11-10 descriptions; individual observation/period details unverified
Questions outside this scope: Repurposing effects during use as continued protection after stopping or using PCR/other coprimary outcomes as effects on each other; Adding the same reports/people/arms/periods/events/endpoints, citations, related sheets as new independent trials or participants; Mixing randomized/ITT denominators, endpoint-specific observation/testing, person/time/event denominators and other cohorts; New effects/CI/invented quantities, equivalence/zero effects, reassessment/grades or independence certification from original numbers; Cod-liver-oil/vitamin/product-use, infection-prevention/COVID-19 management or treatment-replacement instructions

Evidence and sources

The links below lead to the sources. A link alone does not mean the original source was read or its latest publication status verified.

R01 · Brunvoll SH, et al. Prevention of covid-19 and other acute respiratory infections with cod liver oil supplementation. BMJ. 2022;378:e071245. PMID: 36215222.

PubMed

Material type: Quadruple-blinded randomized placebo-controlled trial
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/plans remain unread
Findings recorded in the stored summary: 227 vs 228, RR 1.00 (0.82–1.22); 121 vs 101, RR 1.20 (0.87–1.65); 8,546 vs 8,565, RR 1.00 (0.97–1.04); 3,964 vs 3,834, RR 1.04 (0.97–1.11)
Record level: Parent endpoint summary in the original evidence list; boundaries between the selected interval/PCR result and other outcomes are distinguished in condition rows/roles
Study overlap and independent replication: Separate PCR/other coprimary results from the same Brunvoll trial; no extension to current/single-ingredient prevention. Parent 2972 and existing s0/s1/s2 share the Brunvoll 2022 report, trial of 34,601 people and four-coprimary-outcome context. The same people/arms/periods/tests/events/endpoints, citations, related sheets are not added as new independent trials/participants. Citation-based provisional links do not certify unique trials/participants or independence.

Public availability, access and reading status by material
Material	Public availability	Access status	Actually read	Notes
Stored summary	Local preserved copy of the complete parent summary	Stored summary read	Summary read	Only original PubMed URL/citation and registration identifier are preserved; absent full-text/registration/plan URLs or registration for other reports are not guessed. No new external reading/access or certification that conditions are met.
External abstract	Original identifier/bibliography or required-material entry; public availability/access details remain unverified	Unread; access testing not performed	Not read	Only original PubMed URL/citation and registration identifier are preserved; absent full-text/registration/plan URLs or registration for other reports are not guessed. No new external reading/access or certification that conditions are met.
External full text	Original identifier/bibliography or required-material entry; public availability/access details remain unverified	Unread; access testing not performed	Not read	Only original PubMed URL/citation and registration identifier are preserved; absent full-text/registration/plan URLs or registration for other reports are not guessed. No new external reading/access or certification that conditions are met.
Registration material	Original identifier/bibliography or required-material entry; public availability/access details remain unverified	Unread; access testing not performed	Not read	Only original PubMed URL/citation and registration identifier are preserved; absent full-text/registration/plan URLs or registration for other reports are not guessed. No new external reading/access or certification that conditions are met.
Protocol/SAP	Original identifier/bibliography or required-material entry; public availability/access details remain unverified	Unread; access testing not performed	Not read	Only original PubMed URL/citation and registration identifier are preserved; absent full-text/registration/plan URLs or registration for other reports are not guessed. No new external reading/access or certification that conditions are met.

Report counts versus independent study counts

Separate PCR/other coprimary results from the same Brunvoll trial; no extension to current/single-ingredient prevention. Parent 2972 and existing s0/s1/s2 share the Brunvoll 2022 report, trial of 34,601 people and four-coprimary-outcome context. The same people/arms/periods/tests/events/endpoints, citations, related sheets are not added as new independent trials/participants. Citation-based provisional links do not certify unique trials/participants or independence.

Review criteria

Version 1.0 · Criteria record date 2026-10-06. These are Chamgap's own application conditions, informed by the referenced methods. They do not constitute official assessment-tool certification or a new efficacy score.

N01 · Which existing PCR-infection claim is being presented?

Required materials and conditions: Selected wording, subclaim grade and parent context
Conditions for verification: Show original materials for selected wording, subclaim grade and parent context together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Required
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect selected wording, subclaim grade and parent context with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N02 · Which adults were studied during winter?

Required materials and conditions: Norwegian adults not taking vitamin D daily
Conditions for verification: Show original materials for norwegian adults not taking vitamin D daily together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Required
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect norwegian adults not taking vitamin D daily with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N03 · What is known about winter, the period and duration?

Required materials and conditions: About six winter months, a median 164 days and the stated start
Conditions for verification: Show original materials for about six winter months, a median 164 days and the stated start together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Required
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect about six winter months, a median 164 days and the stated start with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N04 · Was the study product vitamin D or omega-3 alone?

Required materials and conditions: Möller's Tran combination cod liver oil
Conditions for verification: Show original materials for möller's Tran combination cod liver oil together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Required
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect möller's Tran combination cod liver oil with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N05 · Is the flavour-matched corn-oil comparator preserved?

Required materials and conditions: 17,278 assigned cod liver oil versus 17,323 assigned corn oil
Conditions for verification: Show original materials for 17,278 assigned cod liver oil versus 17,323 assigned corn oil together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Required
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect 17,278 assigned cod liver oil versus 17,323 assigned corn oil with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N06 · Are a median 164 days and complete observation/adherence distinguished?

Required materials and conditions: Duration distribution and actual exposure/discontinuation
Conditions for verification: Show original materials for duration distribution and actual exposure/discontinuation together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Required
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect duration distribution and actual exposure/discontinuation with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N07 · What were the original PCR-infection events and effect?

Required materials and conditions: 227 versus 228, RR 1.00 and adjusted 95% CI
Conditions for verification: Show original materials for 227 versus 228, RR 1.00 and adjusted 95% CI together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Required
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect 227 versus 228, RR 1.00 and adjusted 95% CI with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N08 · What is the exact event unit for a positive PCR result?

Required materials and conditions: Confirmed infection, people/tests and repeated events
Conditions for verification: Show original materials for confirmed infection, people/tests and repeated events together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Required
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect confirmed infection, people/tests and repeated events with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N09 · How do testing selection and opportunities affect the comparison?

Required materials and conditions: Detailed gaps in access, symptoms/screening and missed testing
Conditions for verification: Show original materials for detailed gaps in access, symptoms/screening and missed testing together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Required
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect detailed gaps in access, symptoms/screening and missed testing with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N10 · Are ITT for 34,601 adults and endpoint-specific observation denominators separated?

Required materials and conditions: All randomized adults in ITT and the scope of 0.05% missingness
Conditions for verification: Show original materials for all randomized adults in ITT and the scope of 0.05% missingness together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Required
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect all randomized adults in ITT and the scope of 0.05% missingness with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N11 · Are the four coprimary outcomes and multiplicity plan preserved?

Required materials and conditions: Prespecified fallback, adjusted intervals and null outcomes
Conditions for verification: Show original materials for prespecified fallback, adjusted intervals and null outcomes together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Required
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect prespecified fallback, adjusted intervals and null outcomes with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N12 · Is serious COVID-19 distinguished from the overall PCR-infection effect?

Required materials and conditions: 121 versus 101, RR 1.20 and CI 0.87–1.65
Conditions for verification: Show original materials for 121 versus 101, RR 1.20 and CI 0.87–1.65 together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Required
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect 121 versus 101, RR 1.20 and CI 0.87–1.65 with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N13 · Does a negative test independently establish infection prevention?

Required materials and conditions: 8,546 versus 8,565, RR 1.00 and CI 0.97–1.04
Conditions for verification: Show original materials for 8,546 versus 8,565, RR 1.00 and CI 0.97–1.04 together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Required
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect 8,546 versus 8,565, RR 1.00 and CI 0.97–1.04 with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N14 · Is self-reported ARI confirmed SARS-CoV-2 infection?

Required materials and conditions: 3,964 versus 3,834, RR 1.04 and CI 0.97–1.11
Conditions for verification: Show original materials for 3,964 versus 3,834, RR 1.04 and CI 0.97–1.11 together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Required
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect 3,964 versus 3,834, RR 1.04 and CI 0.97–1.11 with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N15 · Were coprimary outcomes or repeated tests in the same people added together?

Required materials and conditions: Endpoint/event overlap and unique people
Conditions for verification: Show original materials for endpoint/event overlap and unique people together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Required
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect endpoint/event overlap and unique people with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N16 · Were between-arm estimates replaced by within-arm changes?

Required materials and conditions: Randomized between-arm RRs and exposure/testing changes
Conditions for verification: Show original materials for randomized between-arm RRs and exposure/testing changes together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Required
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect randomized between-arm RRs and exposure/testing changes with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N17 · Were original allocation and masking descriptions treated as certification?

Required materials and conditions: Independent research-support allocation and masked roles
Conditions for verification: Show original materials for independent research-support allocation and masked roles together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Required
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect independent research-support allocation and masked roles with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N18 · Was the CI range or null result extended into a clinical-threshold conclusion?

Required materials and conditions: PCR RR/adjusted CI and unverified clinical importance
Conditions for verification: Show original materials for pCR RR/adjusted CI and unverified clinical importance together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Required
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect pCR RR/adjusted CI and unverified clinical importance with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N19 · Was the result generalized to current prevention or other ingredients?

Required materials and conditions: Combination-product, period and population boundaries
Conditions for verification: Show original materials for combination-product, period and population boundaries together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Required
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect combination-product, period and population boundaries with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N20 · What is the scope of the low-grade side-effect description?

Required materials and conditions: Reports in both arms and tested dose/population safety
Conditions for verification: Show original materials for reports in both arms and tested dose/population safety together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Supplementary
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect reports in both arms and tested dose/population safety with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N21 · What materials were actually read or acquired?

Required materials and conditions: Preserved summary and external original materials
Conditions for verification: Show original materials for preserved summary and external original materials together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Required
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect preserved summary and external original materials with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N22 · Are historical registration/plans distinguished from current reading?

Required materials and conditions: Original registration identifier and detailed comparison
Conditions for verification: Show original materials for original registration identifier and detailed comparison together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Required
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect original registration identifier and detailed comparison with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N23 · Have protocol/SAP and analysis/missing-data plans been acquired?

Required materials and conditions: Separate materials for prespecified plans/changes
Conditions for verification: Show original materials for separate prespecified-plan and amendment materials together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Required
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect separate prespecified-plan and amendment materials with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N24 · Are sponsorship, funding, products, authors and research involvement separated?

Required materials and conditions: Four company-involvement items and nonprofit/public/academic support
Conditions for verification: Show original materials for four company-involvement items and nonprofit/public/academic support together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Required
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect four company-involvement items and nonprofit/public/academic support with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N25 · Are results by interval/endpoint distinguished from information gaps?

Required materials and conditions: Direct results, unverified details and access status
Conditions for verification: Show original materials for direct results, unverified details and access status together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Required
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect direct results, unverified details and access status with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N26 · Are reports, trials, people, intervals, events and related sheets separated?

Required materials and conditions: Linked records versus unique trials/participants
Conditions for verification: Show original materials for linked records and unique trials/participants together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Required
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect linked records and unique trials/participants with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N27 · Are the original single trial and separate independent replication distinguished?

Required materials and conditions: Parent R1, independence axis and direct replication
Conditions for verification: Show original materials for parent R1, independence axis and direct replication together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Supplementary
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect parent R1, independence axis and direct replication with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N28 · Are the subclaim grade and parent score/axes preserved?

Required materials and conditions: Selected D, missing score/status/axes and parent context
Conditions for verification: Show original materials for selected D, missing score/status/axes and parent context together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Required
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect selected D, missing score/status/axes and parent context with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N29 · Are both languages, citations and absent fields preserved?

Required materials and conditions: Both original languages and absent separate classification information
Conditions for verification: Show original materials for both original languages and absent classification fields together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Required
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect both original languages and absent classification fields with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N30 · Are source dates/corrections/history separated from production dates?

Required materials and conditions: Original 2026-08-26 and new conditions/application
Conditions for verification: Show original materials for original 2026-08-26 and new conditions/application together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Required
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect original 2026-08-26 and new conditions/application with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N31 · What direct materials would fill the selected gaps?

Required materials and conditions: Direct interval/endpoint effects, denominators/CI and follow-up
Conditions for verification: Show original materials for direct interval/endpoint effects, denominators/CI and follow-up together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Supplementary
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect direct interval/endpoint effects, denominators/CI and follow-up with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

N32 · Are applicability records separated from content review and instructions?

Required materials and conditions: Applicability records, existing candidate history and content review
Conditions for verification: Show original materials for condition records, historical candidates and content review together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Requirement and applicability: Supplementary
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Why this condition is needed: Needed to connect condition records, historical candidates and content review with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Referenced methods and the sections actually reviewed

M03 · Cochrane Handbook 6.5 (2024), chapter updated 2023-08

Official methodology · §3.1, §3.2.1–3.2.3, MECIR C5/C7/C13

Referenced principle: Clearly record the question, eligibility conditions and reasons for changes, and distinguish variations in interventions.
Extent of review: Link preserved methodological application records; no current clinical-content reassessment or external-link verification was performed.

M04 · Cochrane Handbook 6.5.1 (2025), chapter updated 2025-03

Official methodology · §4.5, §4.6.1–4.6.3, MECIR C42

Referenced principle: Distinguish studies from reports and link them; do not omit a study solely because results are unreported.
Extent of review: Link preserved methodological application records; no current clinical-content reassessment or external-link verification was performed.

M08 · Cochrane Handbook 6.5 (2024), chapter updated 2019-10

Official methodology · §8.1–8.2.3, Table 8.2.a

Referenced principle: Define the outcome and effect of interest, then examine randomization, deviations, missing data, measurement and selective reporting.
Extent of review: Link preserved methodological application records; no current clinical-content reassessment or external-link verification was performed.

M15 · Cochrane Handbook 6.5 (2024), chapter updated 2023-08

Official methodology · §15.2.4, §15.3.1–15.3.3

Referenced principle: Distinguish effect estimates, intervals, importance and applicability. Sample size alone does not determine precision.
Extent of review: Link preserved methodological application records; no current clinical-content reassessment or external-link verification was performed.

M19 · Cochrane Handbook 6.5 (2024), chapter updated 2019-10

Official methodology · §19.1.2, §19.2.1–19.2.4

Referenced principle: Harm questions may require different designs, populations and follow-up from efficacy questions. Case reports do not establish incidence rates.
Extent of review: Link preserved methodological application records; no current clinical-content reassessment or external-link verification was performed.

What the statuses mean

Partly verified: Some information exists in the preserved review summary; detailed original materials remain unverified. This does not certify a passed review or clinical efficacy.
Unverified: Detailed materials for the selected condition could not be established within the stored scope; this does not mean zero effect, zero studies or safety
Review incomplete: Review of existing content incomplete
Met: Use only within the relevant conditions after existing content review; no automatic designation in this preparation
Not reported: Distinguish only within materials actually read; do not turn unread external materials into unreported findings
Inaccessible: Not applied during this preparation because actual access was not tested
Not applicable: Use with a reason for non-applicability based on an explicit question boundary
Conflicting data: Judge after actual material comparison; review was not performed during this preparation
Insufficient evidence for the conditions: Do not use as a clinical grade encompassing currently unread materials

Change history

2026-10-14 · Public page/material version 1.0

Public pages and materials were prepared from the existing 32 items. No new clinical search, verification-status change or scoring was performed.

The stored-material review date (Not recorded) and original evidence cut-off (2026-08-26) were retained unchanged.

Researcher downloads

These materials provide the same evidence, scope and verification status as this page.

View all item details

N01 · Which existing PCR-infection claim is being presented?

Current findings: The selected claim is reduced PCR-confirmed SARS-CoV-2 infection. Its original subclaim grade is D and its note records a null result, RR 1.00 (CI 0.82–1.22). Missing subclaim score/status/axes are distinguished from the parent D with 34 points and its axes.
Verification status: Partly verified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: PCR-infection definition, population/exposure, prespecified endpoint/estimand, period/denominator and existing question-boundary review. Parent values are not used to fill missing subclaim fields.
Required materials and conditions: Selected wording, subclaim grade and parent context
Materials to obtain first: PCR-infection definition, population/exposure, prespecified endpoint/estimand, period/denominator and existing question-boundary review. Parent values are not used to fill missing subclaim fields.
Further research: Materials needed: PCR-infection definition, population/exposure, prespecified endpoint/estimand, period/denominator and existing question-boundary review. Parent values are not used to fill missing subclaim fields. Only the material request/research need is recorded; no lookup or research is performed now.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for selected wording, subclaim grade and parent context together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect selected wording, subclaim grade and parent context with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N02 · Which adults were studied during winter?

Current findings: The original population was 34,601 Norwegian adults not taking vitamin D supplements daily. Exact age range, baseline vitamin D status/deficiency, conditions, testing/vaccination and concomitant exposures are not established from the summary.
Verification status: Partly verified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Eligibility/exclusions, baseline vitamin D/health, vaccination/infection history and actual exposure/behaviour/medication data. Do not extend to deficient patients or populations in every period.
Required materials and conditions: Norwegian adults not taking vitamin D daily
Materials to obtain first: Eligibility/exclusions, baseline vitamin D/health, vaccination/infection history and actual exposure/behaviour/medication data. Do not extend to deficient patients or populations in every period.
Further research: Materials needed: Eligibility/exclusions, baseline vitamin D/health, vaccination/infection history and actual exposure/behaviour/medication data. Do not extend to deficient patients or populations in every period. Only the material request/research need is recorded; no lookup or research is performed now.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for norwegian adults not taking vitamin D daily together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect norwegian adults not taking vitamin D daily with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N03 · What is known about winter, the period and duration?

Current findings: The original materials record about six winter months, a median 164 days of use, registration posted 2020-10-30 and start 2020-11-10. Actual end/individual follow-up and variant/vaccination/testing-policy details remain unverified. No new end date or observation time is calculated.
Verification status: Partly verified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Actual recruitment/exposure/follow-up dates, season/variant/vaccination/testing policies and discontinuation/loss data. Do not turn this into current COVID-19 or other-period prevention guidance.
Required materials and conditions: About six winter months, a median 164 days and the stated start
Materials to obtain first: Actual recruitment/exposure/follow-up dates, season/variant/vaccination/testing policies and discontinuation/loss data. Do not turn this into current COVID-19 or other-period prevention guidance.
Further research: Materials needed: Actual recruitment/exposure/follow-up dates, season/variant/vaccination/testing policies and discontinuation/loss data. Do not turn this into current COVID-19 or other-period prevention guidance. Only the material request/research need is recorded; no lookup or research is performed now.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for about six winter months, a median 164 days and the stated start together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect about six winter months, a median 164 days and the stated start with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N04 · Was the study product vitamin D or omega-3 alone?

Current findings: The original study used cod liver oil 5 mL/day, supplying vitamin D 10 µg and about 1 g of n-3 fatty acids. This was a combination product; it does not extend to deficiency treatment, high-dose vitamin D or omega-3 alone. No new total ingredient amounts or other vitamin values are created.
Verification status: Partly verified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Exact product/composition/manufacture, actual intake/adherence and concomitant supplement source data. No cod-liver-oil/vitamin/product-use or treatment-replacement instructions.
Required materials and conditions: Möller's Tran combination cod liver oil
Materials to obtain first: Exact product/composition/manufacture, actual intake/adherence and concomitant supplement source data. No cod-liver-oil/vitamin/product-use or treatment-replacement instructions.
Further research: Materials needed: Exact product/composition/manufacture, actual intake/adherence and concomitant supplement source data. No cod-liver-oil/vitamin/product-use or treatment-replacement instructions. Only the material request/research need is recorded; no lookup or research is performed now.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for möller's Tran combination cod liver oil together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect möller's Tran combination cod liver oil with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N05 · Is the flavour-matched corn-oil comparator preserved?

Current findings: The original 34,601 adults were assigned to cod liver oil, 17,278, or flavour-matched corn-oil placebo, 17,323. Actual placebo composition, sensory features/masking, other supplements/diet and concomitant exposures remain unverified. Do not substitute no intervention or a different oil product.
Verification status: Partly verified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Actual active/placebo products, contact/sensory features, concomitant intake, adherence and exposure data. Do not generalize this particular comparison to all cod-liver-oil/vitamin effects.
Required materials and conditions: 17,278 assigned cod liver oil versus 17,323 assigned corn oil
Materials to obtain first: Actual active/placebo products, contact/sensory features, concomitant intake, adherence and exposure data. Do not generalize this particular comparison to all cod-liver-oil/vitamin effects.
Further research: Materials needed: Actual active/placebo products, contact/sensory features, concomitant intake, adherence and exposure data. Do not generalize this particular comparison to all cod-liver-oil/vitamin effects. Only the material request/research need is recorded; no lookup or research is performed now.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for 17,278 assigned cod liver oil versus 17,323 assigned corn oil together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect 17,278 assigned cod liver oil versus 17,323 assigned corn oil with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N06 · Are a median 164 days and complete observation/adherence distinguished?

Current findings: The original duration of use was a median 164 days. This does not mean identical duration/exposure or complete adherence for everyone. Distributions, discontinuation/withdrawal and observation by time remain unverified; cumulative amounts/person-time are not calculated.
Verification status: Partly verified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Actual exposure/adherence, discontinuation, follow-up distributions by arm and endpoint-specific observation periods/missing data. No product-use or COVID-19 management guidance.
Required materials and conditions: Duration distribution and actual exposure/discontinuation
Materials to obtain first: Actual exposure/adherence, discontinuation, follow-up distributions by arm and endpoint-specific observation periods/missing data. No product-use or COVID-19 management guidance.
Further research: Materials needed: Actual exposure/adherence, discontinuation, follow-up distributions by arm and endpoint-specific observation periods/missing data. No product-use or COVID-19 management guidance. Only the material request/research need is recorded; no lookup or research is performed now.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for duration distribution and actual exposure/discontinuation together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect duration distribution and actual exposure/discontinuation with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N07 · What were the original PCR-infection events and effect?

Current findings: Selected PCR infection was null: 227 versus 228, RR 1.00 (adjusted 95% CI 0.82–1.22). No new proportions, risk differences, NNT or P values are calculated from randomized arm sizes; no new verdict of exactly zero effect, equivalence or exclusion of every benefit is made.
Verification status: Partly verified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Original PCR events/denominators, estimand/test, adjusted interval/plan and clinical threshold. No new calculations or invented examples beyond the original effect/CI.
Required materials and conditions: 227 versus 228, RR 1.00 and adjusted 95% CI
Materials to obtain first: Original PCR events/denominators, estimand/test, adjusted interval/plan and clinical threshold. No new calculations or invented examples beyond the original effect/CI.
Further research: Materials needed: Original PCR events/denominators, estimand/test, adjusted interval/plan and clinical threshold. No new calculations or invented examples beyond the original effect/CI. Only the material request/research need is recorded; no lookup or research is performed now.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for 227 versus 228, RR 1.00 and adjusted 95% CI together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect 227 versus 228, RR 1.00 and adjusted 95% CI with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N08 · What is the exact event unit for a positive PCR result?

Current findings: The original endpoint was PCR-confirmed SARS-CoV-2 infection with 227/228 events. Positive tests, people with a first infection, repeated infections/tests, specimens and confirmation rules remain unverified. Tests/repeated time points are not added as new participants/events.
Verification status: Partly verified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Original test/event definitions, person identifiers, first/repeated positives, baseline infection/diagnosis and aggregation/timing data. No new unique-infection or test totals.
Required materials and conditions: Confirmed infection, people/tests and repeated events
Materials to obtain first: Original test/event definitions, person identifiers, first/repeated positives, baseline infection/diagnosis and aggregation/timing data. No new unique-infection or test totals.
Further research: Materials needed: Original test/event definitions, person identifiers, first/repeated positives, baseline infection/diagnosis and aggregation/timing data. No new unique-infection or test totals. Only the material request/research need is recorded; no lookup or research is performed now.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for confirmed infection, people/tests and repeated events together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect confirmed infection, people/tests and repeated events with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N09 · How do testing selection and opportunities affect the comparison?

Current findings: The original materials record PCR-confirmed infection and negative SARS-CoV-2 tests as separate coprimary outcomes. Testing selection, frequency, access, omissions, asymptomatic testing and opportunities/behaviour by arm are not established from the summary.
Verification status: Unverified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Testing/selection criteria, policies/access, opportunities in both arms, missingness/confirmation and prespecified analysis/sensitivity data. Do not repurpose negative tests as absence of infection or a prevention effect.
Required materials and conditions: Detailed gaps in access, symptoms/screening and missed testing
Materials to obtain first: Testing/selection criteria, policies/access, opportunities in both arms, missingness/confirmation and prespecified analysis/sensitivity data. Do not repurpose negative tests as absence of infection or a prevention effect.
Further research: Materials needed: Testing/selection criteria, policies/access, opportunities in both arms, missingness/confirmation and prespecified analysis/sensitivity data. Do not repurpose negative tests as absence of infection or a prevention effect. Only the material request/research need is recorded; no lookup or research is performed now.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for detailed gaps in access, symptoms/screening and missed testing together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect detailed gaps in access, symptoms/screening and missed testing with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N10 · Are ITT for 34,601 adults and endpoint-specific observation denominators separated?

Current findings: All original 34,601 randomized adults were included in ITT; missingness in key variables was 0.05%. This does not establish identical denominators for all PCR observations/tests/analyses or zero missingness in every variable. Actual missing/observed/censored counts remain unverified.
Verification status: Partly verified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Original participant flow by arm, PCR observation/analysis/testing denominators, missing variables/handling and duration/withdrawal/censoring data. No new missing counts/rates or confirmation that everyone completed follow-up.
Required materials and conditions: All randomized adults in ITT and the scope of 0.05% missingness
Materials to obtain first: Original participant flow by arm, PCR observation/analysis/testing denominators, missing variables/handling and duration/withdrawal/censoring data. No new missing counts/rates or confirmation that everyone completed follow-up.
Further research: Materials needed: Original participant flow by arm, PCR observation/analysis/testing denominators, missing variables/handling and duration/withdrawal/censoring data. No new missing counts/rates or confirmation that everyone completed follow-up. Only the material request/research need is recorded; no lookup or research is performed now.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for all randomized adults in ITT and the scope of 0.05% missingness together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect all randomized adults in ITT and the scope of 0.05% missingness with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N11 · Are the four coprimary outcomes and multiplicity plan preserved?

Current findings: The original materials record four prespecified coprimary outcomes—PCR infection, serious COVID-19, negative tests and self-reported ARI—and fallback multiplicity control. Plan details, allocation and decision rules were not confirmed through new registration/SAP reading.
Verification status: Partly verified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Exact endpoints, fallback procedure/intervals/significance levels, amendments/hierarchy in registration/protocol/SAP and original results. No new adjusted P values, calculations or grades.
Required materials and conditions: Prespecified fallback, adjusted intervals and null outcomes
Materials to obtain first: Exact endpoints, fallback procedure/intervals/significance levels, amendments/hierarchy in registration/protocol/SAP and original results. No new adjusted P values, calculations or grades.
Further research: Materials needed: Exact endpoints, fallback procedure/intervals/significance levels, amendments/hierarchy in registration/protocol/SAP and original results. No new adjusted P values, calculations or grades. Only the material request/research need is recorded; no lookup or research is performed now.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for prespecified fallback, adjusted intervals and null outcomes together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect prespecified fallback, adjusted intervals and null outcomes with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N12 · Is serious COVID-19 distinguished from the overall PCR-infection effect?

Current findings: Original serious COVID-19 was null: 121 versus 101, RR 1.20 (CI 0.87–1.65). The exact serious-outcome definition, overlap/denominators and model remain unverified; PCR numerators 227/228 or RR 1.00 are not copied here. No new verdict of a confirmed risk increase is made.
Verification status: Partly verified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Serious-outcome definition, relation to test-confirmed infection, denominators/timing/follow-up, original effect/CI and aggregation data. No new clinical components/event totals or effects.
Required materials and conditions: 121 versus 101, RR 1.20 and CI 0.87–1.65
Materials to obtain first: Serious-outcome definition, relation to test-confirmed infection, denominators/timing/follow-up, original effect/CI and aggregation data. No new clinical components/event totals or effects.
Further research: Materials needed: Serious-outcome definition, relation to test-confirmed infection, denominators/timing/follow-up, original effect/CI and aggregation data. No new clinical components/event totals or effects. Only the material request/research need is recorded; no lookup or research is performed now.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for 121 versus 101, RR 1.20 and CI 0.87–1.65 together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect 121 versus 101, RR 1.20 and CI 0.87–1.65 with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N13 · Does a negative test independently establish infection prevention?

Current findings: Original negative SARS-CoV-2 tests were null: 8,546 versus 8,565, RR 1.00 (CI 0.97–1.04). Testing selection/negative-event definition and person/test overlap remain unverified. Do not repurpose this as people with negative PCR/no infection or a reduction in all infection incidence.
Verification status: Partly verified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Negative-test definition, aggregation/repetition, denominators, testing opportunities, prespecified model and original results. Positives/negatives are not summed into new test totals or unique people.
Required materials and conditions: 8,546 versus 8,565, RR 1.00 and CI 0.97–1.04
Materials to obtain first: Negative-test definition, aggregation/repetition, denominators, testing opportunities, prespecified model and original results. Positives/negatives are not summed into new test totals or unique people.
Further research: Materials needed: Negative-test definition, aggregation/repetition, denominators, testing opportunities, prespecified model and original results. Positives/negatives are not summed into new test totals or unique people. Only the material request/research need is recorded; no lookup or research is performed now.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for 8,546 versus 8,565, RR 1.00 and CI 0.97–1.04 together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect 8,546 versus 8,565, RR 1.00 and CI 0.97–1.04 with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N14 · Is self-reported ARI confirmed SARS-CoV-2 infection?

Current findings: Original self-reported acute respiratory infection was null: 3,964 versus 3,834, RR 1.04 (CI 0.97–1.11). Questionnaire/period/definition, other pathogens and test-confirmation details remain unverified. Do not combine this with PCR-confirmed infection/serious events.
Verification status: Partly verified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Original ARI questions/definition, people/repeated symptoms, actual testing/timing, denominators/model. Do not upgrade self-reports to pathogen-confirmed infection.
Required materials and conditions: 3,964 versus 3,834, RR 1.04 and CI 0.97–1.11
Materials to obtain first: Original ARI questions/definition, people/repeated symptoms, actual testing/timing, denominators/model. Do not upgrade self-reports to pathogen-confirmed infection.
Further research: Materials needed: Original ARI questions/definition, people/repeated symptoms, actual testing/timing, denominators/model. Do not upgrade self-reports to pathogen-confirmed infection. Only the material request/research need is recorded; no lookup or research is performed now.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for 3,964 versus 3,834, RR 1.04 and CI 0.97–1.11 together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect 3,964 versus 3,834, RR 1.04 and CI 0.97–1.11 with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N15 · Were coprimary outcomes or repeated tests in the same people added together?

Current findings: Original event counts for all four endpoints are preserved separately. The overlap between PCR/serious outcomes/negative tests/ARI and repeated time points in the same people remains unverified. Events/denominators are not added into new participant counts, independent trials or infection totals.
Verification status: Partly verified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Person/test/event identifiers, overlap/repetition handling and endpoint-specific denominator/observation data. Overall unique-trial/participant totals remain unrecorded.
Required materials and conditions: Endpoint/event overlap and unique people
Materials to obtain first: Person/test/event identifiers, overlap/repetition handling and endpoint-specific denominator/observation data. Overall unique-trial/participant totals remain unrecorded.
Further research: Materials needed: Person/test/event identifiers, overlap/repetition handling and endpoint-specific denominator/observation data. Overall unique-trial/participant totals remain unrecorded. Only the material request/research need is recorded; no lookup or research is performed now.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for endpoint/event overlap and unique people together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect endpoint/event overlap and unique people with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N16 · Were between-arm estimates replaced by within-arm changes?

Current findings: Original effects are endpoint-specific randomized between-arm RRs/intervals. Individual/within-arm changes in infection exposure, testing behaviour and model adjustment remain unverified. Changes across periods within an arm are not newly calculated as product-specific effects.
Verification status: Partly verified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Original estimand/denominators, between-arm model, period/testing/concomitant exposures and variable/missing-data handling. No new differences, ratios or time-series effects.
Required materials and conditions: Randomized between-arm RRs and exposure/testing changes
Materials to obtain first: Original estimand/denominators, between-arm model, period/testing/concomitant exposures and variable/missing-data handling. No new differences, ratios or time-series effects.
Further research: Materials needed: Original estimand/denominators, between-arm model, period/testing/concomitant exposures and variable/missing-data handling. No new differences, ratios or time-series effects. Only the material request/research need is recorded; no lookup or research is performed now.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for randomized between-arm RRs and exposure/testing changes together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect randomized between-arm RRs and exposure/testing changes with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N17 · Were original allocation and masking descriptions treated as certification?

Current findings: Original materials record allocation by the hospital research-support department without investigator involvement, and masking of participants, investigators, care providers, collectors, assessors and analysts. The original term quadruple-blinded and parent B0 are retained; no new procedural comparison or formal risk-of-bias assessment was performed.
Verification status: Partly verified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Actual concealment/implementation, masking success/unmasking, exposure/deviations and measurement/missing-data source materials. Design strengths and manufacturer support are recorded separately.
Required materials and conditions: Independent research-support allocation and masked roles
Materials to obtain first: Actual concealment/implementation, masking success/unmasking, exposure/deviations and measurement/missing-data source materials. Design strengths and manufacturer support are recorded separately.
Further research: Materials needed: Actual concealment/implementation, masking success/unmasking, exposure/deviations and measurement/missing-data source materials. Design strengths and manufacturer support are recorded separately. Only the material request/research need is recorded; no lookup or research is performed now.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for independent research-support allocation and masked roles together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect independent research-support allocation and masked roles with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N18 · Was the CI range or null result extended into a clinical-threshold conclusion?

Current findings: Original PCR RR 1.00 (CI 0.82–1.22) and subclaim grade D are preserved. No new confirmation is made of a prespecified clinical threshold, exclusion of every benefit, equivalence, high-dose single-ingredient effects or deficiency treatment.
Verification status: Partly verified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Original estimand, adjusted CI/plan, clinical threshold, scope and question-specific direct materials. No new precision/efficacy verdict based only on sample size.
Required materials and conditions: PCR RR/adjusted CI and unverified clinical importance
Materials to obtain first: Original estimand, adjusted CI/plan, clinical threshold, scope and question-specific direct materials. No new precision/efficacy verdict based only on sample size.
Further research: Materials needed: Original estimand, adjusted CI/plan, clinical threshold, scope and question-specific direct materials. No new precision/efficacy verdict based only on sample size. Only the material request/research need is recorded; no lookup or research is performed now.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for pCR RR/adjusted CI and unverified clinical importance together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect pCR RR/adjusted CI and unverified clinical importance with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N19 · Was the result generalized to current prevention or other ingredients?

Current findings: The existing counterview/ad interpretation limits scope to about six winter months of combination cod liver oil in adults not taking vitamin D daily. It does not address deficiency treatment, high-dose vitamin D or omega-3 alone. Do not turn it into current COVID-19 prevention/management or treatment-replacement instructions.
Verification status: Partly verified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Direct population/period/ingredient/dose, intervention/comparator, PCR/clinical endpoint, duration/effect/CI and harm materials. No recommendations or intake guidance.
Required materials and conditions: Combination-product, period and population boundaries
Materials to obtain first: Direct population/period/ingredient/dose, intervention/comparator, PCR/clinical endpoint, duration/effect/CI and harm materials. No recommendations or intake guidance.
Further research: Materials needed: Direct population/period/ingredient/dose, intervention/comparator, PCR/clinical endpoint, duration/effect/CI and harm materials. No recommendations or intake guidance. Only the material request/research need is recorded; no lookup or research is performed now.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for combination-product, period and population boundaries together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect combination-product, period and population boundaries with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N20 · What is the scope of the low-grade side-effect description?

Current findings: The existing safety description records only low-grade side effects in both arms and limits scope to the tested dose/participants. Event types/counts by arm, actual exposure/denominators, discontinuation and causality remain unverified. Do not extend to zero adverse events or long-term safety.
Verification status: Partly verified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Adverse-event collection/grading, events/exposure/harm denominators by arm, discontinuation/causality and long-term materials. No cod-liver-oil/vitamin/infection-management instructions.
Required materials and conditions: Reports in both arms and tested dose/population safety
Materials to obtain first: Adverse-event collection/grading, events/exposure/harm denominators by arm, discontinuation/causality and long-term materials. No cod-liver-oil/vitamin/infection-management instructions.
Further research: Materials needed: Adverse-event collection/grading, events/exposure/harm denominators by arm, discontinuation/causality and long-term materials. No cod-liver-oil/vitamin/infection-management instructions. Only the material request/research need is recorded; no lookup or research is performed now.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for reports in both arms and tested dose/population safety together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect reports in both arms and tested dose/population safety with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N21 · What materials were actually read or acquired?

Current findings: The complete parent summary was read for production and preserved in its original form. Summary reading concerns preserved materials; external abstracts/full texts/registrations/protocols/SAP remain unread. Original citations/URLs do not establish external reading here.
Verification status: Partly verified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Records of actual acquisition/reading scope, versions and dates. No external-link/click/access testing.
Required materials and conditions: Preserved summary and external original materials
Materials to obtain first: Records of actual acquisition/reading scope, versions and dates. No external-link/click/access testing.
Further research: Materials needed: Records of actual acquisition/reading scope, versions and dates. No external-link/click/access testing. Only material requests/research needs are recorded; no search or research was performed in that production.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for preserved summary and external original materials together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect preserved summary and external original materials with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N22 · Are historical registration/plans distinguished from current reading?

Current findings: Existing evidence/Korean text records NCT04609423, posted 2020-10-30 before the 2020-11-10 start, as prospective registration with four matching coprimary endpoints. Official registration URL/version/plan were not newly compared externally; URLs are not guessed.
Verification status: Partly verified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Actual registration versions/publication, recruitment/start/amendments, endpoints/models/analysis intervals and original report links. Preserve historical descriptions without new certification of plans or prospective specification.
Required materials and conditions: Original registration identifier and detailed comparison
Materials to obtain first: Actual registration versions/publication, recruitment/start/amendments, endpoints/models/analysis intervals and original report links. Preserve historical descriptions without new certification of plans or prospective specification.
Further research: Materials needed: Actual registration versions/publication, recruitment/start/amendments, endpoints/models/analysis intervals and original report links. Preserve historical descriptions without new certification of plans or prospective specification. Only the material request/research need is recorded; no lookup or research is performed now.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for original registration identifier and detailed comparison together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect original registration identifier and detailed comparison with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N23 · Have protocol/SAP and analysis/missing-data plans been acquired?

Current findings: Original primary-outcome/ITT/registration descriptions and historical cross-checking are preserved. Actual protocol/SAP versions/timing, interval/endpoint-specific models/censoring/missingness and hierarchy/multiplicity were not newly read.
Verification status: Unverified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Protocol, SAP, amendments, estimands/denominators/analyses, all endpoints and publication timing. Unread materials are not assumed absent.
Required materials and conditions: Separate materials for prespecified plans/changes
Materials to obtain first: Protocol, SAP, amendments, estimands/denominators/analyses, all endpoints and publication timing. Unread materials are not assumed absent.
Further research: Materials needed: Protocol, SAP, amendments, estimands/denominators/analyses, all endpoints and publication timing. Unread materials are not assumed absent. Only the material request/research need is recorded; no lookup or research is performed now.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for separate prespecified-plan and amendment materials together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect separate prespecified-plan and amendment materials with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N24 · Are sponsorship, funding, products, authors and research involvement separated?

Current findings: Orkla Health AS funding and cod-liver-oil/placebo supply, plus Oslo University Hospital/University of Oslo support, are preserved. Outside relationships of KBH with Olympic Seafood/Amgen/Sanofi and SMU with Olympic Seafood, and AS/KTK employment at Age Laboratories AS, are separately recorded. Do not confuse these with newly confirmed product-manufacturer employee authors or design/analysis roles.
Verification status: Partly verified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Separate original materials on company cash funding, product support, employee authors/outside relationships, design/analysis/data control and nonprofit/institutional support. Original independence-axis values are not new certification of all items or independence.
Required materials and conditions: Four company-involvement items and nonprofit/public/academic support
Materials to obtain first: Separate original materials on company cash funding, product support, employee authors/outside relationships, design/analysis/data control and nonprofit/institutional support. Original independence-axis values are not new certification of all items or independence.
Further research: Materials needed: Separate original materials on company cash funding, product support, employee authors/outside relationships, design/analysis/data control and nonprofit/institutional support. Original independence-axis values are not new certification of all items or independence. Only the material request/research need is recorded; no lookup or research is performed now.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for four company-involvement items and nonprofit/public/academic support together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect four company-involvement items and nonprofit/public/academic support with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N25 · Are results by interval/endpoint distinguished from information gaps?

Current findings: Null findings for PCR infection, serious outcomes, negative tests and self-reported ARI are distinguished from unverified event definitions/testing opportunities/denominators and unread details.
Verification status: Partly verified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Direct measurements, original interval/endpoint tables, plans, observations/denominators and actual access records. Do not substitute unread with unreported or null with exactly zero effect/equivalence.
Required materials and conditions: Direct results, unverified details and access status
Materials to obtain first: Direct measurements, original interval/endpoint tables, plans, observations/denominators and actual access records. Do not substitute unread with unreported or null with exactly zero effect/equivalence.
Further research: Materials needed: Direct measurements, original interval/endpoint tables, plans, observations/denominators and actual access records. Do not substitute unread with unreported or null with exactly zero effect/equivalence. Only the material request/research need is recorded; no lookup or research is performed now.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for direct results, unverified details and access status together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect direct results, unverified details and access status with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N26 · Are reports, trials, people, intervals, events and related sheets separated?

Current findings: Parent 2972 and existing s0/s1/s2 share the same Brunvoll 2022 report, trial of 34,601 people and four-coprimary-outcome context. The same people/arms/periods/tests/events/endpoints, citations, related sheets are not added as new independent trials or participants. Linked-report counts do not certify unique-trial/participant totals.
Verification status: Partly verified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Original reports/registration, cohorts/intervals, events/repetition/observation and overlap relationships. Unique-trial/participant totals remain unrecorded.
Required materials and conditions: Linked records versus unique trials/participants
Materials to obtain first: Original reports/registration, cohorts/intervals, events/repetition/observation and overlap relationships. Unique-trial/participant totals remain unrecorded.
Further research: Materials needed: Original reports/registration, cohorts/intervals, events/repetition/observation and overlap relationships. Unique-trial/participant totals remain unrecorded. Only the material request/research need is recorded; no lookup or research is performed now.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for linked records and unique trials/participants together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect linked records and unique trials/participants with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N27 · Are the original single trial and separate independent replication distinguished?

Current findings: Parent R1/I0 are preserved. Intervals/endpoints/related sheets for the same participants are not certified as new independent replication; researcher relationships and manufacturer support remain separately recorded.
Verification status: Unverified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Separate prespecified confirmation matching the question, with direct population/intervention/comparator/endpoint/duration, denominators/effects/CI and funding/author relationships. No new search or independence verdict.
Required materials and conditions: Parent R1, independence axis and direct replication
Materials to obtain first: Separate prespecified confirmation matching the question, with direct population/intervention/comparator/endpoint/duration, denominators/effects/CI and funding/author relationships. No new search or independence verdict.
Further research: Materials needed: Separate prespecified confirmation matching the question, with direct population/intervention/comparator/endpoint/duration, denominators/effects/CI and funding/author relationships. No new search or independence verdict. Only the material request/research need is recorded; no lookup or research is performed now.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for parent R1, independence axis and direct replication together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect parent R1, independence axis and direct replication with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N28 · Are the subclaim grade and parent score/axes preserved?

Current findings: The selected grade/note and bilingual question are preserved; absent subclaim score/status/axes remain unrecorded. Parent D with 34 points, safety and axes remain parent context. They are not repurposed as the selected score and no new grade/RoB2/GRADE certification is created.
Verification status: Partly verified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Existing subclaim/parent-boundary review and actual correction materials. Distinguish absent/original axis values and their history.
Required materials and conditions: Selected D, missing score/status/axes and parent context
Materials to obtain first: Existing subclaim/parent-boundary review and actual correction materials. Distinguish absent/original axis values and their history.
Further research: Materials needed: Existing subclaim/parent-boundary review and actual correction materials. Distinguish absent/original axis values and their history. Only the material request/research need is recorded; no lookup or research is performed now.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for selected D, missing score/status/axes and parent context together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect selected D, missing score/status/axes and parent context with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N29 · Are both languages, citations and absent fields preserved?

Current findings: Preserve parent Korean/English citations/descriptions, evidence/citation lists, axes and selected-subclaim records in the complete summary. Separate classification information in both languages is absent; originals are not filled with new fields. No external English full-text comparison.
Verification status: Partly verified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Materials for reviewing bilingual terminology, time/event/effect units, selected scope and absent fields. Production explanations are distinguished from original records.
Required materials and conditions: Both original languages and absent separate classification information
Materials to obtain first: Materials for reviewing bilingual terminology, time/event/effect units, selected scope and absent fields. Production explanations are distinguished from original records.
Further research: Materials needed: Materials for reviewing bilingual terminology, time/event/effect units, selected scope and absent fields. Production explanations are distinguished from original records. Only the material request/research need is recorded; no lookup or research is performed now.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for both original languages and absent classification fields together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect both original languages and absent classification fields with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N30 · Are source dates/corrections/history separated from production dates?

Current findings: Original evidence date 2026-08-26, empty corrections/deliberation and grade-decision cross-checking are preserved. Historical citation/registration descriptions differ from current production, condition freezing/application and completed content review.
Verification status: Partly verified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Update materials separating originals, events, conditions/observations and verdict decisions when new evidence/corrections arise. Historical wording is not completed clinical content review here.
Required materials and conditions: Original 2026-08-26 and new conditions/application
Materials to obtain first: Update materials separating originals, events, conditions/observations and verdict decisions when new evidence/corrections arise. Historical wording is not completed clinical content review here.
Further research: Materials needed: Update materials separating originals, events, conditions/observations and verdict decisions when new evidence/corrections arise. Historical wording is not completed clinical content review here. Only material requests/research needs are recorded; no search or research was performed in that production.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for original 2026-08-26 and new conditions/application together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect original 2026-08-26 and new conditions/application with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N31 · What direct materials would fill the selected gaps?

Current findings: PCR-infection accuracy/applicability could be clarified by direct testing selection/definition, endpoint denominator/model, adjustment-plan and winter/period/baseline-state materials. Do not extend to other-ingredient treatment or broad prevention.
Verification status: Unverified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Original tables/plans, interval/endpoint definitions, estimands/CI, observation/censoring/denominators, exposure/adherence, independent confirmation and long-term harms. Only the need is recorded; no new lookup/research.
Required materials and conditions: Direct interval/endpoint effects, denominators/CI and follow-up
Materials to obtain first: Original tables/plans, interval/endpoint definitions, estimands/CI, observation/censoring/denominators, exposure/adherence, independent confirmation and long-term harms. Only the need is recorded; no new lookup/research.
Further research: Materials needed: Original tables/plans, interval/endpoint definitions, estimands/CI, observation/censoring/denominators, exposure/adherence, independent confirmation and long-term harms. Only the need is recorded; no new lookup/research. Only the material request/research need is recorded; no lookup or research is performed now.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for direct interval/endpoint effects, denominators/CI and follow-up together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect direct interval/endpoint effects, denominators/CI and follow-up with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01

N32 · Are applicability records separated from content review and instructions?

Current findings: These are summary-based applicability records. Existing content/question-boundary review remains incomplete; candidate pending/eligible markers are preserved as history.
Verification status: Partly verified
Materials actually read: Preserved summary read; external abstracts/full texts/registrations/protocols/SAP remain unread
Why unverified: Production observation distinguishing selected/parent, report and interval/endpoint materials in the preserved summary. Detailed original materials remain unverified and existing content review is incomplete; this does not establish completed clinical review or certification.
Reason for missing information: Existing content review and later actual materials/corrections. The original production did not perform clinical-source comparisons, external access, new calculations, grade changes or product-use/COVID-19 management/infection-prevention/treatment-replacement instructions.
Required materials and conditions: Applicability records, existing candidate history and content review
Materials to obtain first: Existing content review and later actual materials/corrections. The original production did not perform clinical-source comparisons, external access, new calculations, grade changes or product-use/COVID-19 management/infection-prevention/treatment-replacement instructions.
Further research: Materials needed: Existing content review and later actual materials/corrections. The original production did not perform clinical-source comparisons, external access, new calculations, grade changes or product-use/COVID-19 management/infection-prevention/treatment-replacement instructions. Only the material request/research need is recorded; no lookup or research is performed now.
Remaining uncertainty: External original materials remain unread and existing content review is incomplete. Original grades/scores/axes and historical verification/independence descriptions are not upgraded to new verdicts/certification.
Conditions for verification: Show original materials for condition records, historical candidates and content review together with selected-subclaim/parent boundaries, direct endpoints/estimands/denominators and the scope of external reading.
Why this condition is needed: Needed to connect condition records, historical candidates and content review with the selected question, actual population/intervention/comparator, endpoints/estimands, denominators/tests/follow-up and reports/harms.
Application exceptions: Distinguish PCR-confirmed infection, testing selection/repetition, serious outcomes/negative tests/self-reported ARI, four coprimary endpoints/fallback, all randomized participants in ITT/missingness/denominators, winter/period/population, combination product/comparator/exposure, sponsorship/company involvement and harms. Only original numbers are preserved; no new calculations, invented quantities, effects/CI, grades/reassessment, independence certification or cod-liver-oil/vitamin/product-use/infection-prevention/COVID-19 management/treatment-replacement instructions.
Referenced methods: Existing C/E/H distinctions of questions, populations, interventions, comparisons, reports/trials, endpoints/denominators and harms referenced for production

Related sources R01