# Preoperative red-cell transfusion × Reduced clinically important surgical complications in sickle cell disease Verdict 2920 · Evidence Check Stored-material review date: Not recorded Original evidence cut-off: 2026-08-26 Review-criteria version: 1.0 Public page/material preparation date: 2026-10-10 Clinical papers were not read directly; existing review summaries were checked. No new clinical-literature search was performed. Unverified does not mean that research is absent or that there is no effect. ## Assessment scope - Population: Reduced clinically important complications in low- and medium-risk surgery in sickle cell disease - Ingredient, formulation and route: Preoperative red-cell transfusion - Dose: The current article lacks details of the actual transfusion method, dose, targets and schedule; no new procedural guidance is created - Comparator: No transfusion. The reported OR is in the no-transfusion versus transfusion direction - Measured outcome: Clinically important complications from randomization through 30 days after surgery - Duration: Important complications from randomization through 30 days after surgery; the three-month anti-S observation is a separate timepoint - Questions outside this scope: Generalizing effects/safety to other populations, diseases, surgical risks, formulations or timepoints; Adding the same report, population, groups, timepoints or outcomes as new independent trials/participants; Recommending individual treatments, procedures, doses, suitability or usage choices ## Checklist items ### N01 · What are the selected question and existing complete verdict record? Verification status: Partly verified Reading scope: Summary read; external materials not read - Current findings: The selected stored summary concerns reduced clinically important complications in low- and medium-risk surgery in sickle cell disease. The selected question and complete existing verdict record are distinguished. Candidate history is preserved without creating nonexistent subclaims. - Why unverified: Some stored summary content is linked for presentation; clinical confirmation/content review is not complete. The relationship between the original complete verdict and selected question remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; The relationship between the original complete verdict and selected question. - Required materials and conditions: The relationship between the original complete verdict and selected question. - Materials to obtain first: The relationship between the original complete verdict and selected question. - Further research: If the original question is corrected, the complete pre-change text, current verdict linkage and historical candidate records are preserved separately. - Conditions for verification: What are the selected question and existing complete verdict record? Distinguish The relationship between the original complete verdict and selected question in the original material and retain the limits of direct verification. - Why this condition is needed: What are the selected question and existing complete verdict record? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: The existing complete verdict is not converted to a subquestion, and nonexistent subclaims are not created. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N02 · What are the verdict’s actual grade, score, status and axes? Verification status: Partly verified Reading scope: Summary read; external materials not read - Current findings: Original grade B, score 76, axes B/H/R1/I2/E+/B0 and safety caution are used. An existing verification-status field is absent from the stored summary; that absence is recorded. A statement of absent subclaim scores is not applied to a verdict with its own score and axes. - Why unverified: Some stored summary content is linked for presentation; clinical confirmation/content review is not complete. Existing verdict values, original wording and history remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Existing verdict values, original wording and history. - Required materials and conditions: Existing verdict values, original wording and history. - Materials to obtain first: Existing verdict values, original wording and history. - Further research: If a correction occurs, actual before/after values and reasons are preserved as a separate event. - Conditions for verification: What are the verdict’s actual grade, score, status and axes? Distinguish Existing verdict values, original wording and history in the original material and retain the limits of direct verification. - Why this condition is needed: What are the verdict’s actual grade, score, status and axes? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: The verdict’s original values are preserved; this is not a new grade or score judgment. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N03 · What is the scope of null, false, empty values and the historical B0 decision? Verification status: Partly verified Reading scope: Summary read; external materials not read - Current findings: Original precision null, coprimary_split/big_hard_rct/no_human_study false and empty override_reason/override_reason_en strings are preserved. The original B0/B76 decision not to count safety stopping or the 70-person sample as defects is historical. No new criteria or review are run. - Why unverified: Some stored summary content is linked for presentation; clinical confirmation/content review is not complete. Versions of original axes, study assessment and correction history remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Versions of original axes, study assessment and correction history. - Required materials and conditions: Versions of original axes, study assessment and correction history. - Materials to obtain first: Versions of original axes, study assessment and correction history. - Further research: A separate reassessment request must distinguish original history from current production status. - Conditions for verification: What is the scope of null, false, empty values and the historical B0 decision? Distinguish Versions of original axes, study assessment and correction history in the original material and retain the limits of direct verification. - Why this condition is needed: What is the scope of null, false, empty values and the historical B0 decision? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: Historical rules on fewer than 200 participants and stopping classification are not run as current automated checks. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N04 · How are Korean/English, the reference date, corrections and empty arrays preserved? Verification status: Partly verified Reading scope: Summary read; external materials not read - Current findings: Complete Korean/English articles, reference date 2026-08-26 and existing empty correction/subclaim/deliberation values are preserved. Stored cross-check/Primary-source cross-check wording is historical, not completed current review. - Why unverified: Some stored summary content is linked for presentation; clinical confirmation/content review is not complete. Original wording, dates, corrections, structure and additional versions in each language remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Original wording, dates, corrections, structure and additional versions in each language. - Required materials and conditions: Original wording, dates, corrections, structure and additional versions in each language. - Materials to obtain first: Original wording, dates, corrections, structure and additional versions in each language. - Further research: When original text or corrections are added, the complete pre-change text and a separate event are retained. - Conditions for verification: How are Korean/English, the reference date, corrections and empty arrays preserved? Distinguish Original wording, dates, corrections, structure and additional versions in each language in the original material and retain the limits of direct verification. - Why this condition is needed: How are Korean/English, the reference date, corrections and empty arrays preserved? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: Original stored information is distinguished from unread external material. No numbers, calculations or new verdicts beyond the source are created. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N05 · What was actually read, and which external materials remain unread? Verification status: Partly verified Reading scope: Summary read; external materials not read - Current findings: The complete designated stored JSON was read for production. Abstracts, full texts, NCT/ISRCTN registration, protocols, SAPs, DSMC records and original tables were not accessed. Links, stored citations and historical review do not certify current external reading. - Why unverified: Some stored summary content is linked for presentation; clinical confirmation/content review is not complete. Acquisition/reading level for each material and locations of original results/plans remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Acquisition/reading level for each material and locations of original results/plans. - Required materials and conditions: Acquisition/reading level for each material and locations of original results/plans. - Materials to obtain first: Acquisition/reading level for each material and locations of original results/plans. - Further research: Any later direct reading must record its scope, time and version. - Conditions for verification: What was actually read, and which external materials remain unread? Distinguish Acquisition/reading level for each material and locations of original results/plans in the original material and retain the limits of direct verification. - Why this condition is needed: What was actually read, and which external materials remain unread? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: Only URLs were written in the original preparation; no separate link/content checks were performed. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N06 · How are the TAPS bibliography and two registration identifiers linked? Verification status: Partly verified Reading scope: Summary read; external materials not read - Current findings: The direct report is TAPS, Howard J et al., Lancet 2013, PMID 23352054. Stored registration text is NCT00512577 · ISRCTN00862331; both identifiers link to one stored report. DOI, PMCID and registration content are unverified. - Why unverified: Some stored summary content is linked for presentation; clinical confirmation/content review is not complete. Bibliography, paper/registration versions and material linking them to the same trial remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Bibliography, paper/registration versions and material linking them to the same trial. - Required materials and conditions: Bibliography, paper/registration versions and material linking them to the same trial. - Materials to obtain first: Bibliography, paper/registration versions and material linking them to the same trial. - Further research: New reports/registration must distinguish identity, populations and relationships using source material. - Conditions for verification: How are the TAPS bibliography and two registration identifiers linked? Distinguish Bibliography, paper/registration versions and material linking them to the same trial in the original material and retain the limits of direct verification. - Why this condition is needed: How are the TAPS bibliography and two registration identifiers linked? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: The two registration identifiers are not counted as two independent trials. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N07 · How is sharing across the trial, reports, populations and multiple outcomes maintained? Verification status: Partly verified Reading scope: Summary read; external materials not read - Current findings: One direct TAPS report contains clinically important complications, acute chest syndrome, SAEs, transfusion-related complications and alloantibodies. Shared people, groups, events or timepoints are not added as new independent trials/participants. - Why unverified: Some stored summary content is linked for presentation; clinical confirmation/content review is not complete. Relationships/overlap between each outcome, trial, population, analysis set and follow-up remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Relationships/overlap between each outcome, trial, population, analysis set and follow-up. - Required materials and conditions: Relationships/overlap between each outcome, trial, population, analysis set and follow-up. - Materials to obtain first: Relationships/overlap between each outcome, trial, population, analysis set and follow-up. - Further research: Added follow-up/related reports must distinguish population sharing within the existing TAPS family. - Conditions for verification: How is sharing across the trial, reports, populations and multiple outcomes maintained? Distinguish Relationships/overlap between each outcome, trial, population, analysis set and follow-up in the original material and retain the limits of direct verification. - Why this condition is needed: How is sharing across the trial, reports, populations and multiple outcomes maintained? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: A direct report entry does not certify independent unique trial or participant totals. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N08 · What are the population and surgical risk scope? Verification status: Partly verified Reading scope: Summary read; external materials not read - Current findings: The verdict question concerns low-/medium-risk surgery in sickle cell disease. The stored summary lacks detailed ages, genotypes, surgical types, risk classification and eligibility/exclusions, so it is not automatically extended to all sickle cell disease or high-risk surgery. - Why unverified: Some stored summary content is linked for presentation; clinical confirmation/content review is not complete. Original tables of eligibility, exclusions, genotype, surgical risk/type and baseline risk remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Original tables of eligibility, exclusions, genotype, surgical risk/type and baseline risk. - Required materials and conditions: Original tables of eligibility, exclusions, genotype, surgical risk/type and baseline risk. - Materials to obtain first: Original tables of eligibility, exclusions, genotype, surgical risk/type and baseline risk. - Further research: Other surgery/risk populations require direct comparison material for their own question. - Conditions for verification: What are the population and surgical risk scope? Distinguish Original tables of eligibility, exclusions, genotype, surgical risk/type and baseline risk in the original material and retain the limits of direct verification. - Why this condition is needed: What are the population and surgical risk scope? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: Ages, genotypes and risk criteria absent from the original are not filled in. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N09 · How much is verified about baseline disease risk, representativeness and clinical setting? Verification status: Unverified Reading scope: Summary read; external materials not read - Current findings: The current summary lacks disease severity, baseline haemoglobin, previous transfusions, antibodies, comorbidities, recruitment setting and group distributions. The population name and original effect do not guide transfusion suitability for an individual patient. - Why unverified: Required direct details are unverified within the current summary and unread external material. Baseline characteristics, recruitment, distribution, surgery, concurrent care and risk material remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Baseline characteristics, recruitment, distribution, surgery, concurrent care and risk material. - Required materials and conditions: Baseline characteristics, recruitment, distribution, surgery, concurrent care and risk material. - Materials to obtain first: Baseline characteristics, recruitment, distribution, surgery, concurrent care and risk material. - Further research: General application requires direct material showing actual population differences. - Conditions for verification: How much is verified about baseline disease risk, representativeness and clinical setting? Distinguish Baseline characteristics, recruitment, distribution, surgery, concurrent care and risk material in the original material and retain the limits of direct verification. - Why this condition is needed: How much is verified about baseline disease risk, representativeness and clinical setting? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: Original stored information is distinguished from unread external material. No numbers, calculations or new verdicts beyond the source are created. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N10 · What was the original study exposure to preoperative red-cell transfusion? Verification status: Partly verified Reading scope: Summary read; external materials not read - Current findings: The intervention is preoperative red-cell transfusion. The current summary lacks actual methods, units, targets, timing, antigen matching, changes and adherence. No transfusion procedure, dose, target or suitability recommendations are created. - Why unverified: Some stored summary content is linked for presentation; clinical confirmation/content review is not complete. Trial transfusion strategy, actual implementation, products, exposure and change records remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Trial transfusion strategy, actual implementation, products, exposure and change records. - Required materials and conditions: Trial transfusion strategy, actual implementation, products, exposure and change records. - Materials to obtain first: Trial transfusion strategy, actual implementation, products, exposure and change records. - Further research: Effects of other transfusion strategies must be distinguished using direct comparison material. - Conditions for verification: What was the original study exposure to preoperative red-cell transfusion? Distinguish Trial transfusion strategy, actual implementation, products, exposure and change records in the original material and retain the limits of direct verification. - Why this condition is needed: What was the original study exposure to preoperative red-cell transfusion? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: No new Hb targets, exchange/simple transfusion methods, administration schedules or doses are written. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N11 · What are the no-transfusion control and concurrent surgical/care conditions? Verification status: Partly verified Reading scope: Summary read; external materials not read - Current findings: The stored comparison is transfusion versus no transfusion, while the reported OR is no transfusion versus transfusion. Actual surgery, anaesthesia, concurrent care, transfusion changes and rescue treatment details are unverified. - Why unverified: Some stored summary content is linked for presentation; clinical confirmation/content review is not complete. Original control, concurrent care, surgery, actual transfusion changes and timing material remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Original control, concurrent care, surgery, actual transfusion changes and timing material. - Required materials and conditions: Original control, concurrent care, surgery, actual transfusion changes and timing material. - Materials to obtain first: Original control, concurrent care, surgery, actual transfusion changes and timing material. - Further research: Actual strategy implementation material is required to address exposure differences and concurrent-care effects. - Conditions for verification: What are the no-transfusion control and concurrent surgical/care conditions? Distinguish Original control, concurrent care, surgery, actual transfusion changes and timing material in the original material and retain the limits of direct verification. - Why this condition is needed: What are the no-transfusion control and concurrent surgical/care conditions? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: No transfusion is not extended to no lifetime transfusion history or to waiting/treatment recommendations. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N12 · What were the actual procedures of the multicentre randomized sequential superiority trial? Verification status: Unverified Reading scope: Summary read; external materials not read - Current findings: The original design is a multicentre randomized sequential superiority trial. The current summary lacks sequence generation, concealment, stratification, centre implementation and assessment blinding details. Original B0 is not inherited as direct procedural verification. - Why unverified: Required direct details are unverified within the current summary and unread external material. Original allocation, concealment, assessor, centre and sequential-design plans/procedures remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Original allocation, concealment, assessor, centre and sequential-design plans/procedures. - Required materials and conditions: Original allocation, concealment, assessor, centre and sequential-design plans/procedures. - Materials to obtain first: Original allocation, concealment, assessor, centre and sequential-design plans/procedures. - Further research: Added design details must distinguish original reports/historical assessments from actual verification. - Conditions for verification: What were the actual procedures of the multicentre randomized sequential superiority trial? Distinguish Original allocation, concealment, assessor, centre and sequential-design plans/procedures in the original material and retain the limits of direct verification. - Why this condition is needed: What were the actual procedures of the multicentre randomized sequential superiority trial? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: Original stored information is distinguished from unread external material. No numbers, calculations or new verdicts beyond the source are created. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N13 · How do planned 405, enrolled 70 and ITT 67 differ? Verification status: Partly verified Reading scope: Summary read; external materials not read - Current findings: Of a planned 405 participants, 70 were enrolled and 67 analyzed by ITT. Original planned, enrolled and analyzed counts are distinguished. Enrolled 70 is not changed to a completed-randomization count beyond the stored summary, and no differences or proportions are calculated. - Why unverified: Some stored summary content is linked for presentation; clinical confirmation/content review is not complete. Recruitment, allocation, surgery, follow-up and ITT flow; exclusions, missingness and group definitions remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Recruitment, allocation, surgery, follow-up and ITT flow; exclusions, missingness and group definitions. - Required materials and conditions: Recruitment, allocation, surgery, follow-up and ITT flow; exclusions, missingness and group definitions. - Materials to obtain first: Recruitment, allocation, surgery, follow-up and ITT flow; exclusions, missingness and group definitions. - Further research: An original flow diagram showing actual analysis-population pathways is needed. - Conditions for verification: How do planned 405, enrolled 70 and ITT 67 differ? Distinguish Recruitment, allocation, surgery, follow-up and ITT flow; exclusions, missingness and group definitions in the original material and retain the limits of direct verification. - Why this condition is needed: How do planned 405, enrolled 70 and ITT 67 differ? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: No new lost/excluded participant counts or recruitment completion rates are calculated from current numbers. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N14 · What are the events, groups and denominators in 13/33 and 5/34? Verification status: Partly verified Reading scope: Summary read; external materials not read - Current findings: Clinically important complications were no transfusion 13/33 (39%) versus transfusion 5/34 (15%). These are original group values for the same verdict, not mixed with separate acute chest syndrome or SAE measures. - Why unverified: Some stored summary content is linked for presentation; clinical confirmation/content review is not complete. Original outcome tables, analysis populations, event adjudication, overlap and follow-up definitions remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Original outcome tables, analysis populations, event adjudication, overlap and follow-up definitions. - Required materials and conditions: Original outcome tables, analysis populations, event adjudication, overlap and follow-up definitions. - Materials to obtain first: Original outcome tables, analysis populations, event adjudication, overlap and follow-up definitions. - Further research: Added direct outcome material must link each event to its group denominator. - Conditions for verification: What are the events, groups and denominators in 13/33 and 5/34? Distinguish Original outcome tables, analysis populations, event adjudication, overlap and follow-up definitions in the original material and retain the limits of direct verification. - Why this condition is needed: What are the events, groups and denominators in 13/33 and 5/34? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: Original stored information is distinguished from unread external material. No numbers, calculations or new verdicts beyond the source are created. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N15 · What are the direction and interval of the no-transfusion versus transfusion OR? Verification status: Partly verified Reading scope: Summary read; external materials not read - Current findings: Reported no-transfusion versus transfusion OR: 3.8 (95% CI 1.2–12.2). Its direction is retained, without conversion to a transfusion versus no-transfusion OR, RR, HR or survival outcome. No P value or other effect absent from the stored summary is calculated. - Why unverified: Some stored summary content is linked for presentation; clinical confirmation/content review is not complete. Details of the original OR model, analysis population, adjustment and interval remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Details of the original OR model, analysis population, adjustment and interval. - Required materials and conditions: Details of the original OR model, analysis population, adjustment and interval. - Materials to obtain first: Details of the original OR model, analysis population, adjustment and interval. - Further research: The original explanation of the estimand, direction and scale is needed. - Conditions for verification: What are the direction and interval of the no-transfusion versus transfusion OR? Distinguish Details of the original OR model, analysis population, adjustment and interval in the original material and retain the limits of direct verification. - Why this condition is needed: What are the direction and interval of the no-transfusion versus transfusion OR? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: The OR is not converted to its reciprocal, a risk ratio or a new relative reduction. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N16 · What is the original comparison behind the absolute difference of -24 percentage points? Verification status: Partly verified Reading scope: Summary read; external materials not read - Current findings: The original absolute difference of -24 percentage points is preserved in the context of important surgical complications: no transfusion 39% versus transfusion 15%. No new absolute difference, NNT, treated-person example or interval is calculated. - Why unverified: Some stored summary content is linked for presentation; clinical confirmation/content review is not complete. Original absolute-effect population, time, analysis and interval remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Original absolute-effect population, time, analysis and interval. - Required materials and conditions: Original absolute-effect population, time, analysis and interval. - Materials to obtain first: Original absolute-effect population, time, analysis and interval. - Further research: Added original explanations should link the absolute effect to its relevant scope. - Conditions for verification: What is the original comparison behind the absolute difference of -24 percentage points? Distinguish Original absolute-effect population, time, analysis and interval in the original material and retain the limits of direct verification. - Why this condition is needed: What is the original comparison behind the absolute difference of -24 percentage points? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: Original absolute values are not copied to long-term survival or effects in other surgery. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N17 · What is the observation window for clinically important complications? Verification status: Partly verified Reading scope: Summary read; external materials not read - Current findings: The endpoint runs from randomization through 30 days after surgery. Thirty days after surgery is distinguished from the transfusion group’s three-month alloantibody observation; the complication window is not changed to simply 30 days after enrollment. - Why unverified: Some stored summary content is linked for presentation; clinical confirmation/content review is not complete. Original outcome-specific starting points, surgery dates, risk periods, follow-up and censoring remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Original outcome-specific starting points, surgery dates, risk periods, follow-up and censoring. - Required materials and conditions: Original outcome-specific starting points, surgery dates, risk periods, follow-up and censoring. - Materials to obtain first: Original outcome-specific starting points, surgery dates, risk periods, follow-up and censoring. - Further research: Outcomes at each timepoint must be linked to their relevant analysis windows. - Conditions for verification: What is the observation window for clinically important complications? Distinguish Original outcome-specific starting points, surgery dates, risk periods, follow-up and censoring in the original material and retain the limits of direct verification. - Why this condition is needed: What is the observation window for clinically important complications? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: Original stored information is distinguished from unread external material. No numbers, calculations or new verdicts beyond the source are created. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N18 · How much is known about important complication definitions, components and adjudication? Verification status: Unverified Reading scope: Summary read; external materials not read - Current findings: The original important-complication definition and some acute chest syndrome/SAE values are available, but full components, overlap, first events, severity, assessors, blinding and ascertainment details are unverified. Equal reductions in all components are not newly established. - Why unverified: Required direct details are unverified within the current summary and unread external material. Complication components, severity, adjudication, overlap, original outcomes and plans remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Complication components, severity, adjudication, overlap, original outcomes and plans. - Required materials and conditions: Complication components, severity, adjudication, overlap, original outcomes and plans. - Materials to obtain first: Complication components, severity, adjudication, overlap, original outcomes and plans. - Further research: Direct material presenting the composite and individual components side by side is needed. - Conditions for verification: How much is known about important complication definitions, components and adjudication? Distinguish Complication components, severity, adjudication, overlap, original outcomes and plans in the original material and retain the limits of direct verification. - Why this condition is needed: How much is known about important complication definitions, components and adjudication? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: Original stored information is distinguished from unread external material. No numbers, calculations or new verdicts beyond the source are created. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N19 · What separate outcome is acute chest syndrome in 9 versus 1 participants? Verification status: Partly verified Reading scope: Summary read; external materials not read - Current findings: Original acute chest syndrome counts are 9 versus 1 participants. The no-transfusion versus transfusion context is retained; absent denominators, proportions, effects, CIs or P values for that outcome are not calculated from other outcome numbers. - Why unverified: Some stored summary content is linked for presentation; clinical confirmation/content review is not complete. The event definition, original tables, denominators, periods and between-group analyses remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; The event definition, original tables, denominators, periods and between-group analyses. - Required materials and conditions: The event definition, original tables, denominators, periods and between-group analyses. - Materials to obtain first: The event definition, original tables, denominators, periods and between-group analyses. - Further research: Direct material for each component must be linked separately from the composite outcome. - Conditions for verification: What separate outcome is acute chest syndrome in 9 versus 1 participants? Distinguish The event definition, original tables, denominators, periods and between-group analyses in the original material and retain the limits of direct verification. - Why this condition is needed: What separate outcome is acute chest syndrome in 9 versus 1 participants? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: The 9 and 1 participants are not added independently to SAEs or total complications as separate events/people. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N20 · What are the original serious adverse event counts, denominators and proportions? Verification status: Partly verified Reading scope: Summary read; external materials not read - Current findings: SAEs were no transfusion 10/33 (30%) versus transfusion 1/34 (3%). These outcomes come from the same trial as complications and acute chest syndrome; detailed overlap is unverified. No new effect, CI or P value is created. - Why unverified: Some stored summary content is linked for presentation; clinical confirmation/content review is not complete. SAE definitions, periods, calculation, overlap, group tables and plans remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; SAE definitions, periods, calculation, overlap, group tables and plans. - Required materials and conditions: SAE definitions, periods, calculation, overlap, group tables and plans. - Materials to obtain first: SAE definitions, periods, calculation, overlap, group tables and plans. - Further research: Direct material on the reason for safety stopping and original SAE analysis is needed. - Conditions for verification: What are the original serious adverse event counts, denominators and proportions? Distinguish SAE definitions, periods, calculation, overlap, group tables and plans in the original material and retain the limits of direct verification. - Why this condition is needed: What are the original serious adverse event counts, denominators and proportions? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: SAEs and important complication events are not independently added together. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N21 · How did the first planned interim analysis differ from the later unplanned safety analysis? Verification status: Partly verified Reading scope: Summary read; external materials not read - Current findings: At the first planned interim analysis, no stopping boundaries had been crossed and the trial continued. The original sequence is retained: an unexpected SAE imbalance later led the DSMC to request an unscheduled interim analysis and recommend stopping for safety. - Why unverified: Some stored summary content is linked for presentation; clinical confirmation/content review is not complete. Prespecified sequential plans, interim results, DSMC decisions, dates and stopping records remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Prespecified sequential plans, interim results, DSMC decisions, dates and stopping records. - Required materials and conditions: Prespecified sequential plans, interim results, DSMC decisions, dates and stopping records. - Materials to obtain first: Prespecified sequential plans, interim results, DSMC decisions, dates and stopping records. - Further research: Added original decision material must separately record plans, actual events and interpretation. - Conditions for verification: How did the first planned interim analysis differ from the later unplanned safety analysis? Distinguish Prespecified sequential plans, interim results, DSMC decisions, dates and stopping records in the original material and retain the limits of direct verification. - Why this condition is needed: How did the first planned interim analysis differ from the later unplanned safety analysis? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: The trial is not re-described as stopping for efficacy after crossing the first planned boundary. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N22 · How are safety stopping and the original B0/sample-size defect treatment related? Verification status: Partly verified Reading scope: Summary read; external materials not read - Current findings: The historical assessment says stopping was not at a prespecified primary-endpoint boundary and the safety stop was unavoidable, so early stopping and fewer than 200 participants were not counted as defects. This history is preserved alongside the facts: enrolled 70, ITT 67 and planned 405. - Why unverified: Some stored summary content is linked for presentation; clinical confirmation/content review is not complete. Stopping circumstances, original verdict rationale and actual plans/analyses remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Stopping circumstances, original verdict rationale and actual plans/analyses. - Required materials and conditions: Stopping circumstances, original verdict rationale and actual plans/analyses. - Materials to obtain first: Stopping circumstances, original verdict rationale and actual plans/analyses. - Further research: A separate correction to the original decision must preserve before/after wording and reasons. - Conditions for verification: How are safety stopping and the original B0/sample-size defect treatment related? Distinguish Stopping circumstances, original verdict rationale and actual plans/analyses in the original material and retain the limits of direct verification. - Why this condition is needed: How are safety stopping and the original B0/sample-size defect treatment related? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: No new sample-size criteria, bias grades or defect scores are calculated. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N23 · What effect-size uncertainty arises from the small sample and early termination? Verification status: Partly verified Reading scope: Summary read; external materials not read - Current findings: The original counterpoint says the small sample and early termination may have overestimated the effect size. The original OR 95% CI width, 1.2–12.2, is preserved without new precision-axis or reliability scores. - Why unverified: Some stored summary content is linked for presentation; clinical confirmation/content review is not complete. Original effect estimation, sequential analysis, stopping, sensitivity and independent outcome material remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Original effect estimation, sequential analysis, stopping, sensitivity and independent outcome material. - Required materials and conditions: Original effect estimation, sequential analysis, stopping, sensitivity and independent outcome material. - Materials to obtain first: Original effect estimation, sequential analysis, stopping, sensitivity and independent outcome material. - Further research: Direct comparison material with independent replication and sufficient events/follow-up is needed. - Conditions for verification: What effect-size uncertainty arises from the small sample and early termination? Distinguish Original effect estimation, sequential analysis, stopping, sensitivity and independent outcome material in the original material and retain the limits of direct verification. - Why this condition is needed: What effect-size uncertainty arises from the small sample and early termination? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: Uncertainty is not converted into deletion of the original positive result or a new null verdict. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N24 · What are the details of ITT, missingness, changes and follow-up? Verification status: Unverified Reading scope: Summary read; external materials not read - Current findings: ITT 67 and group counts 33/34 are preserved. Enrollment, analysis inclusion, surgery not performed, treatment changes, missingness, follow-up and analysis handling details are unverified. Group results are not assigned a denominator of all enrollees. - Why unverified: Required direct details are unverified within the current summary and unread external material. Original flow diagrams, ITT definitions, changes, missingness, follow-up and sensitivity analyses remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Original flow diagrams, ITT definitions, changes, missingness, follow-up and sensitivity analyses. - Required materials and conditions: Original flow diagrams, ITT definitions, changes, missingness, follow-up and sensitivity analyses. - Materials to obtain first: Original flow diagrams, ITT definitions, changes, missingness, follow-up and sensitivity analyses. - Further research: Material linking the planned estimand to the actual analysis population is needed. - Conditions for verification: What are the details of ITT, missingness, changes and follow-up? Distinguish Original flow diagrams, ITT definitions, changes, missingness, follow-up and sensitivity analyses in the original material and retain the limits of direct verification. - Why this condition is needed: What are the details of ITT, missingness, changes and follow-up? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: Original stored information is distinguished from unread external material. No numbers, calculations or new verdicts beyond the source are created. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N25 · What is verified about the prespecified primary endpoint, sequential boundaries and multiple comparisons? Verification status: Unverified Reading scope: Summary read; external materials not read - Current findings: Historical explanations of the randomized sequential superiority trial and interim analyses are preserved. Actual registration/protocol/SAP details of primary-outcome hierarchy, stopping rules, multiple comparisons, adjustment and analysis versions remain unread. - Why unverified: Required direct details are unverified within the current summary and unread external material. Registration, protocol, SAP and DSMC document versions, changes, hypotheses and hierarchy remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Registration, protocol, SAP and DSMC document versions, changes, hypotheses and hierarchy. - Required materials and conditions: Registration, protocol, SAP and DSMC document versions, changes, hypotheses and hierarchy. - Materials to obtain first: Registration, protocol, SAP and DSMC document versions, changes, hypotheses and hierarchy. - Further research: Any later comparison of prespecified plans with reports must retain its actual scope. - Conditions for verification: What is verified about the prespecified primary endpoint, sequential boundaries and multiple comparisons? Distinguish Registration, protocol, SAP and DSMC document versions, changes, hypotheses and hierarchy in the original material and retain the limits of direct verification. - Why this condition is needed: What is verified about the prespecified primary endpoint, sequential boundaries and multiple comparisons? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: Original stored information is distinguished from unread external material. No numbers, calculations or new verdicts beyond the source are created. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N26 · What is the scope of 0 versus 0 clinically important transfusion-related complications? Verification status: Partly verified Reading scope: Summary read; external materials not read - Current findings: The original description of zero clinically important transfusion-related complications in both TAPS groups is preserved. The stored summary did not test this comparison, so no between-group significance wording is used and not all transfusion harms are established as absent or harmless. - Why unverified: Some stored summary content is linked for presentation; clinical confirmation/content review is not complete. Event definitions, collection, periods, denominators, testing plans and follow-up material remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Event definitions, collection, periods, denominators, testing plans and follow-up material. - Required materials and conditions: Event definitions, collection, periods, denominators, testing plans and follow-up material. - Materials to obtain first: Event definitions, collection, periods, denominators, testing plans and follow-up material. - Further research: Rare transfusion harms require material with sufficient exposure, collection and follow-up. - Conditions for verification: What is the scope of 0 versus 0 clinically important transfusion-related complications? Distinguish Event definitions, collection, periods, denominators, testing plans and follow-up material in the original material and retain the limits of direct verification. - Why this condition is needed: What is the scope of 0 versus 0 clinically important transfusion-related complications? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: Zero observed events are not changed into zero risk or safety noninferiority. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N27 · What separate harm is the three-month anti-S alloantibody observation? Verification status: Partly verified Reading scope: Summary read; external materials not read - Current findings: One participant in the transfusion group developed an anti-S red-cell alloantibody at three months. This is separate from the primary complication window through 30 days after surgery. Incidence, between-group effects, P values or CIs absent from the summary are not calculated. - Why unverified: Some stored summary content is linked for presentation; clinical confirmation/content review is not complete. Original antibody tests, follow-up, group collection, denominators, clinical impact and persistence remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Original antibody tests, follow-up, group collection, denominators, clinical impact and persistence. - Required materials and conditions: Original antibody tests, follow-up, group collection, denominators, clinical impact and persistence. - Materials to obtain first: Original antibody tests, follow-up, group collection, denominators, clinical impact and persistence. - Further research: Long-term alloimmunization effects require direct ascertainment, comparison and follow-up material. - Conditions for verification: What separate harm is the three-month anti-S alloantibody observation? Distinguish Original antibody tests, follow-up, group collection, denominators, clinical impact and persistence in the original material and retain the limits of direct verification. - Why this condition is needed: What separate harm is the three-month anti-S alloantibody observation? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: One participant is not converted into a new 1/34 proportion or long-term disease value. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N28 · What remains unverified about acute/delayed haemolytic reactions and alloimmunization? Verification status: Unverified Reading scope: Summary read; external materials not read - Current findings: The original counterview explains alloimmunization and acute/delayed haemolytic transfusion reaction risks. Beyond TAPS important complications 0 versus 0 and one anti-S participant, detailed frequencies, ascertainment and long-term results for each harm are unverified. - Why unverified: Required direct details are unverified within the current summary and unread external material. Definitions, collection, denominators, ascertainment and long-term follow-up for each harm remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Definitions, collection, denominators, ascertainment and long-term follow-up for each harm. - Required materials and conditions: Definitions, collection, denominators, ascertainment and long-term follow-up for each harm. - Materials to obtain first: Definitions, collection, denominators, ascertainment and long-term follow-up for each harm. - Further research: Material documenting actual harm collection/ascertainment and direct clinical impact is needed. - Conditions for verification: What remains unverified about acute/delayed haemolytic reactions and alloimmunization? Distinguish Definitions, collection, denominators, ascertainment and long-term follow-up for each harm in the original material and retain the limits of direct verification. - Why this condition is needed: What remains unverified about acute/delayed haemolytic reactions and alloimmunization? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: Original stored information is distinguished from unread external material. No numbers, calculations or new verdicts beyond the source are created. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N29 · How much is known about harm collection, ascertainment, recurrence and causality adjudication? Verification status: Unverified Reading scope: Summary read; external materials not read - Current findings: Some original transfusion-harm/SAE values are available, but collection, assessors, severity, recurrence, event relatedness, risk periods and safety-denominator details are unverified. Observed events are distinguished from established causality. - Why unverified: Required direct details are unverified within the current summary and unread external material. Original safety tables, collection, relatedness adjudication, recurrence, denominators and follow-up remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Original safety tables, collection, relatedness adjudication, recurrence, denominators and follow-up. - Required materials and conditions: Original safety tables, collection, relatedness adjudication, recurrence, denominators and follow-up. - Materials to obtain first: Original safety tables, collection, relatedness adjudication, recurrence, denominators and follow-up. - Further research: Harm signals must be supplemented by actual exposure, timing, ascertainment and alternative-factor material. - Conditions for verification: How much is known about harm collection, ascertainment, recurrence and causality adjudication? Distinguish Original safety tables, collection, relatedness adjudication, recurrence, denominators and follow-up in the original material and retain the limits of direct verification. - Why this condition is needed: How much is known about harm collection, ascertainment, recurrence and causality adjudication? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: Original stored information is distinguished from unread external material. No numbers, calculations or new verdicts beyond the source are created. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N30 · Are a safety imbalance and long-term harmlessness the same conclusion? Verification status: Partly verified Reading scope: Summary read; external materials not read - Current findings: The historical recommendation to stop for safety following an SAE imbalance in the no-transfusion group is retained alongside harms of transfusion itself. A signal of comparative advantage does not establish harmlessness for every patient/long-term transfusion or suitability for every surgery. - Why unverified: Some stored summary content is linked for presentation; clinical confirmation/content review is not complete. Safety hypotheses, decisions, long-term follow-up and comparisons for each exposure, group and event remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Safety hypotheses, decisions, long-term follow-up and comparisons for each exposure, group and event. - Required materials and conditions: Safety hypotheses, decisions, long-term follow-up and comparisons for each exposure, group and event. - Materials to obtain first: Safety hypotheses, decisions, long-term follow-up and comparisons for each exposure, group and event. - Further research: Long-term/rare transfusion harms and clinical benefits each require direct material. - Conditions for verification: Are a safety imbalance and long-term harmlessness the same conclusion? Distinguish Safety hypotheses, decisions, long-term follow-up and comparisons for each exposure, group and event in the original material and retain the limits of direct verification. - Why this condition is needed: Are a safety imbalance and long-term harmlessness the same conclusion? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: Original stored information is distinguished from unread external material. No numbers, calculations or new verdicts beyond the source are created. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N31 · What were NHSBT public sponsorship, author employment and research roles? Verification status: Partly verified Reading scope: Summary read; external materials not read - Current findings: NHS Blood and Transplant sponsored the trial; five authors were employed by NHSBT. Original information that NHSBT and the MRC Clinical Studies Unit performed design, data collection, analysis and interpretation is retained. Public funding and actual involvement are shown together. - Why unverified: Some stored summary content is linked for presentation; clinical confirmation/content review is not complete. Original sponsorship, employment, research-role, data-access and COI disclosures remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Original sponsorship, employment, research-role, data-access and COI disclosures. - Required materials and conditions: Original sponsorship, employment, research-role, data-access and COI disclosures. - Materials to obtain first: Original sponsorship, employment, research-role, data-access and COI disclosures. - Further research: Added role disclosures must record actual involvement and analysis/data relationships. - Conditions for verification: What were NHSBT public sponsorship, author employment and research roles? Distinguish Original sponsorship, employment, research-role, data-access and COI disclosures in the original material and retain the limits of direct verification. - Why this condition is needed: What were NHSBT public sponsorship, author employment and research roles? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: Public funding is not changed into absence of research involvement. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N32 · What are the details of contracts, data access, publication and other COI? Verification status: Unverified Reading scope: Summary read; external materials not read - Current findings: The summary describes sponsorship, author employment, design, collection, analysis and interpretation, but contract, data-access, publication-decision and other conflict details are unverified. Original I2 is not inherited as new analysis-independence certification. - Why unverified: Required direct details are unverified within the current summary and unread external material. Original COI, contract, data-access, analysis and publication-role disclosures remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Original COI, contract, data-access, analysis and publication-role disclosures. - Required materials and conditions: Original COI, contract, data-access, analysis and publication-role disclosures. - Materials to obtain first: Original COI, contract, data-access, analysis and publication-role disclosures. - Further research: Claims of broader independence require actual data-sharing, involvement and analysis-relationship material. - Conditions for verification: What are the details of contracts, data access, publication and other COI? Distinguish Original COI, contract, data-access, analysis and publication-role disclosures in the original material and retain the limits of direct verification. - Why this condition is needed: What are the details of contracts, data access, publication and other COI? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: Original stored information is distinguished from unread external material. No numbers, calculations or new verdicts beyond the source are created. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N33 · How is a single confirmatory report distinguished from additional independent replication? Verification status: Unverified Reading scope: Summary read; external materials not read - Current findings: The evidence weight describes a single small confirmatory trial, and the original overall summary says independent replication is needed. One direct report, two registrations and multiple outcomes are not added as new independent replications. Additional direct trials are unverified in the current input. - Why unverified: Required direct details are unverified within the current summary and unread external material. Linkage material for new bibliography, registration, populations, designs, exposures and outcomes remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Linkage material for new bibliography, registration, populations, designs, exposures and outcomes. - Required materials and conditions: Linkage material for new bibliography, registration, populations, designs, exposures and outcomes. - Materials to obtain first: Linkage material for new bibliography, registration, populations, designs, exposures and outcomes. - Further research: Added independent results must first distinguish population/report sharing with existing TAPS. - Conditions for verification: How is a single confirmatory report distinguished from additional independent replication? Distinguish Linkage material for new bibliography, registration, populations, designs, exposures and outcomes in the original material and retain the limits of direct verification. - Why this condition is needed: How is a single confirmatory report distinguished from additional independent replication? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: Original stored information is distinguished from unread external material. No numbers, calculations or new verdicts beyond the source are created. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N34 · Is the related case 1485 hydroxyurea verdict the same question? Verification status: Partly verified Reading scope: Summary read; external materials not read - Current findings: Case 1485 concerns routine prevention of vaso-occlusive complications in adults with sickle cell anaemia, linked with historical B77. Its population and purpose differ from preparation for low-/medium-risk surgery here. That page was not read and is not counted as a direct TAPS report or new trial. - Why unverified: Some stored summary content is linked for presentation; clinical confirmation/content review is not complete. Disease, population, purpose, timepoint and intervention differences, with direct material remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Disease, population, purpose, timepoint and intervention differences, with direct material. - Required materials and conditions: Disease, population, purpose, timepoint and intervention differences, with direct material. - Materials to obtain first: Disease, population, purpose, timepoint and intervention differences, with direct material. - Further research: Related questions are not combined solely because they name the same disease; differences in conditions and purpose are retained. - Conditions for verification: Is the related case 1485 hydroxyurea verdict the same question? Distinguish Disease, population, purpose, timepoint and intervention differences, with direct material in the original material and retain the limits of direct verification. - Why this condition is needed: Is the related case 1485 hydroxyurea verdict the same question? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: The citation’s JSON-path verification label is historical; it does not mean the link was checked or read here. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: ### N35 · Can the findings be extended to other surgical risks, genotypes, ages or transfusion strategies? Verification status: Unverified Reading scope: Summary read; external materials not read - Current findings: The current verdict preserves the original preoperative transfusion comparison in low-/medium-risk surgery. Benefits/harms for other surgical risks, disease types, ages, baseline antibodies or transfusion strategies are not automatically established as identical. Relevant direct material is unverified. - Why unverified: Required direct details are unverified within the current summary and unread external material. Direct comparison material showing population, surgery and exposure-strategy differences remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Direct comparison material showing population, surgery and exposure-strategy differences. - Required materials and conditions: Direct comparison material showing population, surgery and exposure-strategy differences. - Materials to obtain first: Direct comparison material showing population, surgery and exposure-strategy differences. - Further research: Clinical outcomes under other conditions must be distinguished using their relevant populations, strategies and follow-up. - Conditions for verification: Can the findings be extended to other surgical risks, genotypes, ages or transfusion strategies? Distinguish Direct comparison material showing population, surgery and exposure-strategy differences in the original material and retain the limits of direct verification. - Why this condition is needed: Can the findings be extended to other surgical risks, genotypes, ages or transfusion strategies? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: No recommendations on transfusion suitability, methods, products, doses or surgical choice are made. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N36 · Does a reduction in complications answer survival, quality of life and every long-term outcome? Verification status: Unverified Reading scope: Summary read; external materials not read - Current findings: Original results for actual clinically important surgical complications are preserved. Direct long-term survival, quality-of-life, all-complication and routine disease-control values are absent, so they do not substitute for those separate questions. - Why unverified: Required direct details are unverified within the current summary and unread external material. Direct definitions, comparisons, denominators and follow-up for long-term, patient-reported and other clinical outcomes remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Direct definitions, comparisons, denominators and follow-up for long-term, patient-reported and other clinical outcomes. - Required materials and conditions: Direct definitions, comparisons, denominators and follow-up for long-term, patient-reported and other clinical outcomes. - Materials to obtain first: Direct definitions, comparisons, denominators and follow-up for long-term, patient-reported and other clinical outcomes. - Further research: Broader clinical-outcome scope requires direct outcome material for each question. - Conditions for verification: Does a reduction in complications answer survival, quality of life and every long-term outcome? Distinguish Direct definitions, comparisons, denominators and follow-up for long-term, patient-reported and other clinical outcomes in the original material and retain the limits of direct verification. - Why this condition is needed: Does a reduction in complications answer survival, quality of life and every long-term outcome? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: Original stored information is distinguished from unread external material. No numbers, calculations or new verdicts beyond the source are created. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N37 · What remains unverified about prespecified subgroup, component and multiple-outcome effects? Verification status: Unverified Reading scope: Summary read; external materials not read - Current findings: Total important complications and some event counts are preserved, but group-specific subgroup/component plans, precision, interactions and multiple-comparison details are unverified. The overall OR is not copied to every component/population. - Why unverified: Required direct details are unverified within the current summary and unread external material. Prespecified subgroups, components, hierarchy, multiple comparisons and original analysis tables remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Prespecified subgroups, components, hierarchy, multiple comparisons and original analysis tables. - Required materials and conditions: Prespecified subgroups, components, hierarchy, multiple comparisons and original analysis tables. - Materials to obtain first: Prespecified subgroups, components, hierarchy, multiple comparisons and original analysis tables. - Further research: Direct material answering each outcome/subgroup and prespecified plans are needed. - Conditions for verification: What remains unverified about prespecified subgroup, component and multiple-outcome effects? Distinguish Prespecified subgroups, components, hierarchy, multiple comparisons and original analysis tables in the original material and retain the limits of direct verification. - Why this condition is needed: What remains unverified about prespecified subgroup, component and multiple-outcome effects? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: Original stored information is distinguished from unread external material. No numbers, calculations or new verdicts beyond the source are created. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N38 · How much is verified about transfusion/event timing and alternative factors? Verification status: Unverified Reading scope: Summary read; external materials not read - Current findings: Detailed timing between underlying disease, previous transfusions, concurrent care, surgery type, changes and events is unverified. Randomized strategy comparisons are distinguished from attributing every individual event to a single cause. - Why unverified: Required direct details are unverified within the current summary and unread external material. Baseline risk, actual exposure, care, changes, event timing and adjudication material remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Baseline risk, actual exposure, care, changes, event timing and adjudication material. - Required materials and conditions: Baseline risk, actual exposure, care, changes, event timing and adjudication material. - Materials to obtain first: Baseline risk, actual exposure, care, changes, event timing and adjudication material. - Further research: Interpreting harms and clinical course requires direct records, ascertainment and comparisons. - Conditions for verification: How much is verified about transfusion/event timing and alternative factors? Distinguish Baseline risk, actual exposure, care, changes, event timing and adjudication material in the original material and retain the limits of direct verification. - Why this condition is needed: How much is verified about transfusion/event timing and alternative factors? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: Original stored information is distinguished from unread external material. No numbers, calculations or new verdicts beyond the source are created. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N39 · How are direct clinical outcomes, a large original effect and uncertainty preserved together? Verification status: Partly verified Reading scope: Summary read; external materials not read - Current findings: Original B76 and wording of a large important-complication reduction, actual events 13/33 versus 5/34 and the OR direction/interval are preserved. Small sample, safety stopping, transfusion harms and the need for independent replication remain limitations. - Why unverified: Some stored summary content is linked for presentation; clinical confirmation/content review is not complete. Relevant original outcome, design, follow-up, uncertainty and independent-material scope remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Relevant original outcome, design, follow-up, uncertainty and independent-material scope. - Required materials and conditions: Relevant original outcome, design, follow-up, uncertainty and independent-material scope. - Materials to obtain first: Relevant original outcome, design, follow-up, uncertainty and independent-material scope. - Further research: Additional material directly addressing clinical benefits and harms is separately needed. - Conditions for verification: How are direct clinical outcomes, a large original effect and uncertainty preserved together? Distinguish Relevant original outcome, design, follow-up, uncertainty and independent-material scope in the original material and retain the limits of direct verification. - Why this condition is needed: How are direct clinical outcomes, a large original effect and uncertainty preserved together? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: Original stored information is distinguished from unread external material. No numbers, calculations or new verdicts beyond the source are created. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ### N40 · What is preserved when material, corrections or record-location displays are updated? Verification status: Partly verified Reading scope: Summary read; external materials not read - Current findings: The existing complete verdict, selected question, candidate history, Korean/English articles, dates and empty correction-history values are retained. New material must separate the complete pre-change stored summary, version/reason, condition changes and separate application of observations. - Why unverified: Some stored summary content is linked for presentation; clinical confirmation/content review is not complete. Version relationships between new material, corrections, changed text, questions, conditions and observations remains subject to user review. - Reason for missing information: External abstracts, full texts, registration, plans and original tables remain unread; Version relationships between new material, corrections, changed text, questions, conditions and observations. - Required materials and conditions: Version relationships between new material, corrections, changed text, questions, conditions and observations. - Materials to obtain first: Version relationships between new material, corrections, changed text, questions, conditions and observations. - Further research: Separately added follow-up material must retain report/population sharing and the user-review scope. - Conditions for verification: What is preserved when material, corrections or record-location displays are updated? Distinguish Version relationships between new material, corrections, changed text, questions, conditions and observations in the original material and retain the limits of direct verification. - Why this condition is needed: What is preserved when material, corrections or record-location displays are updated? This is needed to distinguish the relevant outcome, population and design from other scopes. - Application exceptions: No new searches, calculations, grades or treatment/procedural guidance are created in this production. - Remaining uncertainty: Absence or unread external material does not mean zero effect, zero events, no paper, failed access or a new verdict. - Referenced methods: Study-family condition definitions linked to the stored original; no official clinical method assessment was run. - Related sources: R01 ## Evidence and sources ### R01 Howard J, et al. Lancet. 2013. PMID: 23352054. [PubMed](https://pubmed.ncbi.nlm.nih.gov/23352054/) Materials actually read: Summary read; external papers and registration unread Findings recorded in the summary: 13/33 (39%) versus 5/34 (15%); absolute difference -24 percentage points; no-transfusion versus transfusion OR 3.8 (95% CI 1.2–12.2) Record level: Reported values from the existing review summary. The original paper was not directly verified in this work. Independent replication: Original functional/clinical outcomes, analyses, harms and related timepoints share one TAPS report/population; they are not added as new independent replications. | Material | Public availability | Access status | Actually read | Notes | |---|---|---|---|---| | Stored existing review summary | Stored summary | Locally stored existing review summary read for preparation | Summary read | The existing complete review summary was read for production; the original paper was not acquired or read. | | Paper abstract | External material unread; needed | Access not attempted; not obtained | Not read | Only the bibliographic PMID link was connected. The actual abstract and result locations were not directly verified. | | Full paper | External material unread; needed | Access not attempted; not obtained | Not read | The URL is a bibliographic link; full-text acquisition and accessibility were not verified. | | Clinical trial registration | External material unread; needed | Access not attempted; not obtained | Not read | Only original registration-identifier text is preserved. Registration content, versions, first date, changes and comparison with reports are unverified. | | Study protocol | External material unread; needed | Access not attempted; not obtained | Not read | Original sequential-design, hypothesis, transfusion-strategy, outcome-component, interim-analysis and DSMC stopping-plan documents have not been acquired. | | Statistical analysis plan | External material unread; needed | Access not attempted; not obtained | Not read | Direct plans for analysis populations, estimands, adjustment, missingness, sensitivity, hierarchy and precision have not been acquired. | | Original results and safety tables | External material unread; needed | Access not attempted; not obtained | Not read | Original definitions, group outcomes, timing and denominators are needed for important complications, acute chest syndrome, SAEs, transfusion harms, alloantibodies and stopping. | | Sponsorship and interest disclosures | External material unread; needed | Access not attempted; not obtained | Not read | Beyond stored funding/role information, original contract, data-access, publication-decision and author-specific COI documents have not been acquired. | | Verdict on a different related question | External material unread; needed | Access not attempted; not obtained | Not read | A historical link distinguishing routine prevention in the same disease from original preoperative preparation. It is not a direct TAPS report or independent replication; that page was not read. | ## Review criteria and methods These are Chamgap's own application conditions, informed by the relevant sections of official methodological guidance. They do not constitute official assessment-tool certification or a new efficacy score. - M03 [Cochrane Handbook 6.5 (2024), chapter updated 2023-08](https://www.cochrane.org/authors/handbooks-and-manuals/handbook/current/chapter-03) · §3.1, §3.2.1–3.2.3, MECIR C5/C7/C13 · Clearly record the question, eligibility conditions and reasons for changes, and distinguish variations in interventions. · Methodological principles stated in existing pilot materials and condition templates were referenced. The methodological text was not reviewed again in this work. - M04 [Cochrane Handbook 6.5.1 (2025), chapter updated 2025-03](https://www.cochrane.org/authors/handbooks-and-manuals/handbook/current/chapter-04) · §4.5, §4.6.1–4.6.3, MECIR C42 · Distinguish studies from reports and link them; do not omit a study solely because results are unreported. · Methodological principles stated in existing pilot materials and condition templates were referenced. The methodological text was not reviewed again in this work. - M08 [Cochrane Handbook 6.5 (2024), chapter updated 2019-10](https://www.cochrane.org/authors/handbooks-and-manuals/handbook/current/chapter-08) · §8.1–8.2.3, Table 8.2.a · Define the outcome and effect of interest, then examine randomization, deviations, missing data, measurement and selective reporting. · Methodological principles stated in existing pilot materials and condition templates were referenced. The methodological text was not reviewed again in this work. - M15 [Cochrane Handbook 6.5 (2024), chapter updated 2023-08](https://www.cochrane.org/authors/handbooks-and-manuals/handbook/current/chapter-15) · §15.2.4, §15.3.1–15.3.3 · Distinguish effect estimates, intervals, importance and applicability. Sample size alone does not determine precision. · Methodological principles stated in existing pilot materials and condition templates were referenced. The methodological text was not reviewed again in this work. - M19 [Cochrane Handbook 6.5 (2024), chapter updated 2019-10](https://www.cochrane.org/authors/handbooks-and-manuals/handbook/current/chapter-19) · §19.1.2, §19.2.1–19.2.4 · Harm questions may require different designs, populations and follow-up from efficacy questions. Case reports do not establish incidence rates. · Methodological principles stated in existing pilot materials and condition templates were referenced. The methodological text was not reviewed again in this work. ## What the statuses mean - Met: The original content has been reviewed as meeting the conditions. This status is not used in this preparation. - Partly verified: Some information in the stored summary was linked during preparation; clinical verification or review is not complete. - Unverified: Required direct values, definitions or materials have not been established within the current storage and reading scope. This does not mean zero effect, no papers or failed access. - Review incomplete: Awaiting user review, or actual review remains incomplete. - Not reported: Used only when original materials were actually read and the outcome was judged unreported. Not used for external materials unread in this work. - Inaccessible: Used only when an actual access attempt has a recorded failure. Not used for access that was not attempted in this work. - Insufficient evidence for the conditions: Indicates insufficient direct materials for the relevant scope or conditions; it is not a new grade. - Not applicable: Used when the reason it does not apply to the original question is stated. - Conflicting data: Retains the scope of conflicting statements in original materials; it is not an arbitrary reassessment. ## Change history 2026-10-10 · Public page/materials 1.0. The public page and data were prepared from the existing 40 items. No new clinical search, verification-status change or scoring was performed.