{
  "schema_version": "chamgap-public-criteria-1.0",
  "title": "Oral vitamin C × serum urate: a small average reduction differs from gout treatment",
  "language": "en",
  "translation_date": "2026-10-22",
  "criteria_version": "1.0",
  "criteria_date": "2026-10-06",
  "condition_origin": "Chamgap's own application conditions",
  "method_sources": [
    {
      "id": "M03",
      "version": "Cochrane Handbook 6.5 (2024), chapter updated 2023-08",
      "url": "https://www.cochrane.org/authors/handbooks-and-manuals/handbook/current/chapter-03",
      "section": "§3.1, §3.2.1–3.2.3, MECIR C5/C7/C13",
      "official_principle": "Clearly record the question, eligibility conditions and reasons for changes, and distinguish variations in interventions.",
      "review_level": "Existing methodological links were reused for production. External originals were not reread and methodological content was not reassessed."
    },
    {
      "id": "M04",
      "version": "Cochrane Handbook 6.5.1 (2025), chapter updated 2025-03",
      "url": "https://www.cochrane.org/authors/handbooks-and-manuals/handbook/current/chapter-04",
      "section": "§4.5, §4.6.1–4.6.3, MECIR C42",
      "official_principle": "Distinguish studies from reports and link them; do not omit a study solely because results are unreported.",
      "review_level": "Existing methodological links were reused for production. External originals were not reread and methodological content was not reassessed."
    },
    {
      "id": "M08",
      "version": "Cochrane Handbook 6.5 (2024), chapter updated 2019-10",
      "url": "https://www.cochrane.org/authors/handbooks-and-manuals/handbook/current/chapter-08",
      "section": "§8.1–8.2.3, Table 8.2.a",
      "official_principle": "Define the outcome and effect of interest, then examine randomization, deviations, missing data, measurement and selective reporting.",
      "review_level": "Existing methodological links were reused for production. External originals were not reread and methodological content was not reassessed."
    },
    {
      "id": "M15",
      "version": "Cochrane Handbook 6.5 (2024), chapter updated 2023-08",
      "url": "https://www.cochrane.org/authors/handbooks-and-manuals/handbook/current/chapter-15",
      "section": "§15.2.4, §15.3.1–15.3.3",
      "official_principle": "Distinguish effect estimates, intervals, importance and applicability. Sample size alone does not determine precision.",
      "review_level": "Existing methodological links were reused for production. External originals were not reread and methodological content was not reassessed."
    },
    {
      "id": "M19",
      "version": "Cochrane Handbook 6.5 (2024), chapter updated 2019-10",
      "url": "https://www.cochrane.org/authors/handbooks-and-manuals/handbook/current/chapter-19",
      "section": "§19.1.2, §19.2.1–19.2.4",
      "official_principle": "Harm questions may require different designs, populations and follow-up from efficacy questions. Case reports do not establish incidence rates.",
      "review_level": "Existing methodological links were reused for production. External originals were not reread and methodological content was not reassessed."
    }
  ],
  "status_dictionary": {
    "Partly verified": "Partial information from the stored summary is linked; detailed originals and content review remain incomplete.",
    "Unverified": "Required details cannot be established within the preserved scope. This does not establish absence of effects or studies, or safety.",
    "Review incomplete": "Review of existing content remains incomplete.",
    "Met": "This state is used only within the relevant conditions after material verification and content review. It was not automatically assigned in this work.",
    "Not reported": "Unreported within material actually read. Unread external material is not relabeled as unreported.",
    "Inaccessible": "This means actual access failure. External access was not attempted in this work, so this state was not assigned.",
    "Not applicable": "Used only with an application exception and reason based on the question scope.",
    "Conflicting data": "This requires actual comparison of materials; no new conflict judgment was made in this work.",
    "Insufficient evidence for the conditions": "This indicates gaps in additional material for the selected conditions. Unread material as a whole is not converted into an efficacy grade."
  },
  "requirements": [
    {
      "item_id": "N01",
      "question_type": "Evidence condition",
      "question": "Which urate question is addressed?",
      "needed": "Direct comparison of oral single-ingredient C and serum urate in adults",
      "role": "Required",
      "role_reason": "Material on Direct comparison of oral single-ingredient C and serum urate in adults is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on Direct comparison of oral single-ingredient C and serum urate in adults must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: Original population, comparator and blood-test endpoint/time tables are needed. Gout prevention, cure or replacement of standard medication is not added. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N02",
      "question_type": "Evidence condition",
      "question": "Are tablets/capsules and C-added drinks distinguished?",
      "needed": "Products/ingredients of ascorbic acid tablets/capsules and sugar-matched added-C drinks",
      "role": "Required",
      "role_reason": "Material on Products/ingredients of ascorbic acid tablets/capsules and sugar-matched added-C drinks is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on Products/ingredients of ascorbic acid tablets/capsules and sugar-matched added-C drinks must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: Original product, salt, added ingredients/sugars, manufacturing, excipients and single-agent conditions are needed. Formulation equivalence is not certified. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N03",
      "question_type": "Evidence condition",
      "question": "Are 500 mg and nominal 600/measured 592±12 mg retained?",
      "needed": "Trial-specific dose, measured content, frequency and exposure",
      "role": "Required",
      "role_reason": "Material on Trial-specific dose, measured content, frequency and exposure is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on Trial-specific dose, measured content, frequency and exposure must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: Original measurement, dispersion definition, ingredients, administration/adherence and trial-specific dose linkage are needed. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N04",
      "question_type": "Evidence condition",
      "question": "Are 2 months, 8 weeks and 2 weeks retained separately?",
      "needed": "Original-trial exposure, measurement and follow-up end points",
      "role": "Required",
      "role_reason": "Material on Original-trial exposure, measurement and follow-up end points is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on Original-trial exposure, measurement and follow-up end points must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: Each report’s original schedule, actual dosing, post-stopping course and period/time linkage are needed. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N05",
      "question_type": "Evidence condition",
      "question": "Are non-gout, healthy high-urate and established-gout populations distinguished?",
      "needed": "Population-specific baseline urate, diagnosis, deficiency and urate medication",
      "role": "Required",
      "role_reason": "Material on Population-specific baseline urate, diagnosis, deficiency and urate medication is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on Population-specific baseline urate, diagnosis, deficiency and urate medication must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: Original diagnosis, baseline tests, medication/deficiency, eligibility/exclusions and group tables are needed. A pooled mean is not used as every population’s value. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N06",
      "question_type": "Evidence condition",
      "question": "Are placebo, drinks and allopurinol retained as different contrasts?",
      "needed": "R01 placebo, R02 active-drug and R03 sugar-matched drink conditions",
      "role": "Required",
      "role_reason": "Material on R01 placebo, R02 active-drug and R03 sugar-matched drink conditions is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on R01 placebo, R02 active-drug and R03 sugar-matched drink conditions must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: Original report/stratum-specific group conditions, drug initiation/titration, matched drinks and common care are needed. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N07",
      "question_type": "Evidence condition",
      "question": "Can diet, urate medication, coadministration and adherence be separated?",
      "needed": "Baseline medication, treatment changes, diet/drinks and actual exposure",
      "role": "Required",
      "role_reason": "Material on Baseline medication, treatment changes, diet/drinks and actual exposure is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on Baseline medication, treatment changes, diet/drinks and actual exposure must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: Original maintained/changed medication, diet, common care, adherence and discontinuation records are needed. An isolated C effect is not established. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N08",
      "question_type": "Evidence condition",
      "question": "What are the R01 sample of 184 and group analysis denominators?",
      "needed": "Huang trial allocation, analysis, completion and urate denominators",
      "role": "Required",
      "role_reason": "Material on Huang trial allocation, analysis, completion and urate denominators is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on Huang trial allocation, analysis, completion and urate denominators must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: Original group flow, analysis/completion, missing endpoints and exclusion/missingness rules are needed. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N09",
      "question_type": "Evidence condition",
      "question": "What are R01 group-specific changes and CIs?",
      "needed": "Separate C/placebo change intervals and the between-group test",
      "role": "Required",
      "role_reason": "Material on Separate C/placebo change intervals and the between-group test is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on Separate C/placebo change intervals and the between-group test must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: Original change/variance, groups/time points, denominators and adjustment/test tables are needed. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N10",
      "question_type": "Evidence condition",
      "question": "Is the existing −0.59 calculation distinguished from its missing CI?",
      "needed": "Historical simple change difference and original between-group estimate/CI",
      "role": "Required",
      "role_reason": "Material on Historical simple change difference and original between-group estimate/CI is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on Historical simple change difference and original between-group estimate/CI must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: Original between-group estimates, variance, CIs and model are needed. Group-specific CIs are not reused or reverse-calculated. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N11",
      "question_type": "Evidence condition",
      "question": "Are R01 allocation, blinding and prior urate hierarchy known?",
      "needed": "Sequence, concealment, blinding, registration/SAP and primary endpoint",
      "role": "Required",
      "role_reason": "Material on Sequence, concealment, blinding, registration/SAP and primary endpoint is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on Sequence, concealment, blinding, registration/SAP and primary endpoint must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: Original methods, registration, plans and all endpoints/time points are needed. No formal RoB2/GRADE is produced. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N12",
      "question_type": "Evidence condition",
      "question": "Are the two R02 allopurinol strata kept distinct from treatment arms?",
      "needed": "Allocation/denominators within strata of 20 prior users and 20 nonusers",
      "role": "Required",
      "role_reason": "Material on Allocation/denominators within strata of 20 prior users and 20 nonusers is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on Allocation/denominators within strata of 20 prior users and 20 nonusers must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: Stratum-specific drug initiation/titration, group allocation/analysis, baseline urate and flow tables are needed. Participants are not summed. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N13",
      "question_type": "Evidence condition",
      "question": "What are the urate reductions in the R02 active comparison?",
      "needed": "Contrast, P value and adjusted CI for reductions of 0.23 versus 1.9 mg/dL",
      "role": "Required",
      "role_reason": "Material on Contrast, P value and adjusted CI for reductions of 0.23 versus 1.9 mg/dL is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on Contrast, P value and adjusted CI for reductions of 0.23 versus 1.9 mg/dL must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: Original stratum/group, variance, model, CI and time/denominator result tables are needed. No new difference, 0 effect or flare-prevention estimate is created. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N14",
      "question_type": "Evidence condition",
      "question": "Are the R02 open-label design and registration citation distinct from actual plans?",
      "needed": "Open-label pilot methods and official ACTRN history",
      "role": "Required",
      "role_reason": "Material on Open-label pilot methods and official ACTRN history is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on Open-label pilot methods and official ACTRN history must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: Original methods, within-stratum allocation, registration/changes and protocol/SAP are needed. A registration identifier does not establish prespecification or reading. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N15",
      "question_type": "Evidence condition",
      "question": "Is the 2026 two-period/group design preserved?",
      "needed": "HesperidrinC groups/periods, drinks and crossover/allocation conditions",
      "role": "Required",
      "role_reason": "Material on HesperidrinC groups/periods, drinks and crossover/allocation conditions is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on HesperidrinC groups/periods, drinks and crossover/allocation conditions must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: Original allocation/sequence, periods, drink conditions, washout, assessments/denominators and plans are needed. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N16",
      "question_type": "Evidence condition",
      "question": "Are 43 assigned, 40 analysed and 20 each for C/control distinguished?",
      "needed": "R03 allocation, analysis and single-agent drink contrast denominators",
      "role": "Required",
      "role_reason": "Material on R03 allocation, analysis and single-agent drink contrast denominators is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on R03 allocation, analysis and single-agent drink contrast denominators must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: Original group/period flow, endpoint denominators, missingness/exclusions and same-participant linkage are needed. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N17",
      "question_type": "Evidence condition",
      "question": "Are time-specific R03 model mean±SE values preserved?",
      "needed": "C/control baseline, week 1 and week 2 model means/SE",
      "role": "Required",
      "role_reason": "Material on C/control baseline, week 1 and week 2 model means/SE is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on C/control baseline, week 1 and week 2 model means/SE must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: Original units, model, adjustment, time/group, denominators and all contrasts are needed. SE is not relabeled as SD/CI and differences are not calculated. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N18",
      "question_type": "Evidence condition",
      "question": "Are within-C P values distinguished from undetected between-drink differences?",
      "needed": "Within-group week 1 test and time-specific control contrasts",
      "role": "Required",
      "role_reason": "Material on Within-group week 1 test and time-specific control contrasts is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on Within-group week 1 test and time-specific control contrasts must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: Original between-group estimates/CIs, multiplicity, model and all time points are needed. Within-group significance is not converted into a placebo effect, equivalence or precise null effect. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N19",
      "question_type": "Evidence condition",
      "question": "Are C+hesperidin and observational diet excluded from single-agent effects?",
      "needed": "Original contrasts for single-agent drinks versus combinations/natural diet",
      "role": "Required",
      "role_reason": "Material on Original contrasts for single-agent drinks versus combinations/natural diet is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on Original contrasts for single-agent drinks versus combinations/natural diet must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: Original drink ingredients, allocation/periods, single-agent contrasts and distinction from combination/observational material are needed. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N20",
      "question_type": "Evidence condition",
      "question": "Are R03 official registration hierarchy and the paper-reported number distinguished?",
      "needed": "Official NCT04316390 change history and primary endpoints/time points",
      "role": "Required",
      "role_reason": "Material on Official NCT04316390 change history and primary endpoints/time points is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on Official NCT04316390 change history and primary endpoints/time points must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: Original registration, changes, plans and analysis tables are needed. Current registration reading, compliance or prespecification is not certified. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N21",
      "question_type": "Evidence condition",
      "question": "Is the pooled report of 13 RCTs kept distinct from a new primary trial?",
      "needed": "Juraschek review included/shared trials, extraction and heterogeneity",
      "role": "Required",
      "role_reason": "Material on Juraschek review included/shared trials, extraction and heterogeneity is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on Juraschek review included/shared trials, extraction and heterogeneity must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: Original inclusion/extraction tables, model, CIs, denominators and shared-trial/report links are needed. Review and primary-trial participants are not summed. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N22",
      "question_type": "Evidence condition",
      "question": "Are differences by disease, baseline status and medication retained?",
      "needed": "Directness for gout/non-gout, high urate, deficiency and medication",
      "role": "Required",
      "role_reason": "Material on Directness for gout/non-gout, high urate, deficiency and medication is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on Directness for gout/non-gout, high urate, deficiency and medication must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: Original disease/baseline, formulation, duration, medication-specific effects/denominators and prespecified subgroups/interactions are needed. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N23",
      "question_type": "Evidence condition",
      "question": "Are urate units, measurement and analysis sets distinguished?",
      "needed": "mg/dL, mmol/L, baseline/change values and measurement/adjustment",
      "role": "Required",
      "role_reason": "Material on mg/dL, mmol/L, baseline/change values and measurement/adjustment is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on mg/dL, mmol/L, baseline/change values and measurement/adjustment must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: Original assay, units, blood sampling/time points, baseline adjustment, variance and estimand are needed. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N24",
      "question_type": "Evidence condition",
      "question": "What is the original impact of missingness, attrition and selective reporting?",
      "needed": "Group/stratum/period missingness, discontinuation, denominators and handling",
      "role": "Required",
      "role_reason": "Material on Group/stratum/period missingness, discontinuation, denominators and handling is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on Group/stratum/period missingness, discontinuation, denominators and handling must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: Flow, attrition/exclusions, missing-data handling, all planned time points and sensitivity material are needed. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N25",
      "question_type": "Evidence condition",
      "question": "Are first-onset gout, recurrence, cure and drug replacement kept separate?",
      "needed": "Direct comparison of serum urate and clinical gout events",
      "role": "Supplementary",
      "role_reason": "Material on Direct comparison of serum urate and clinical gout events is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on Direct comparison of serum urate and clinical gout events must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: Direct tests of attacks, first onset, recurrence or drug replacement are separately needed. Other verdicts/research are not newly accessed here. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N26",
      "question_type": "Evidence condition",
      "question": "Are four company-involvement pathways and the three trials retained separately?",
      "needed": "Funding, in-kind/product support, employee authors and COI",
      "role": "Required",
      "role_reason": "Material on Funding, in-kind/product support, employee authors and COI is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on Funding, in-kind/product support, employee authors and COI must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: Original funding, in-kind/products, affiliations, COI and report-specific linkage are needed. Overall I2 and specific R03 I1 records are not replaced or rescored. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N27",
      "question_type": "Evidence condition",
      "question": "Are 4 reports distinguished from unique trials and participants?",
      "needed": "Research families/shared samples of three original trials/comparisons and a review",
      "role": "Required",
      "role_reason": "Material on Research families/shared samples of three original trials/comparisons and a review is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on Research families/shared samples of three original trials/comparisons and a review must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: Registration, institutions/timing, teams, products and included/additional-report/same-sample links are needed. Final totals are null. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N28",
      "question_type": "Evidence condition",
      "question": "Are harm collection, events and discontinuation known?",
      "needed": "Definition, collection and events/discontinuation for diarrhoea/gastrointestinal harms",
      "role": "Supplementary",
      "role_reason": "Material on Definition, collection and events/discontinuation for diarrhoea/gastrointestinal harms is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on Definition, collection and events/discontinuation for diarrhoea/gastrointestinal harms must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: Original harm methods, severity, events/discontinuation, missingness and comparator records are needed. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N29",
      "question_type": "Evidence condition",
      "question": "What are the safety denominators, exposure and comparators?",
      "needed": "Group/stratum/period actual treatment, safety sets and exposure/events",
      "role": "Supplementary",
      "role_reason": "Material on Group/stratum/period actual treatment, safety sets and exposure/events is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on Group/stratum/period actual treatment, safety sets and exposure/events must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: Group-specific safety denominators, exposure/discontinuation, events and comparator/stratum/period linkage are needed. Incidence and totals are not calculated. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N30",
      "question_type": "Evidence condition",
      "question": "What is known about kidney disease, stones, iron overload, coadministration and long-term harms?",
      "needed": "Vulnerable groups, alternative causes/medication and rare/long-term/independent harms",
      "role": "Supplementary",
      "role_reason": "Material on Vulnerable groups, alternative causes/medication and rare/long-term/independent harms is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on Vulnerable groups, alternative causes/medication and rare/long-term/independent harms must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: Vulnerable populations, coadministration, event timing/alternative causes, independent reports, longer exposure and denominators are needed. No new harm search or judgment is performed. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N31",
      "question_type": "Evidence condition",
      "question": "Are historical HTML/PDF/abstract checks distinguished from current unread material?",
      "needed": "Original access record, stored summary and external abstracts/full text/registration/plans",
      "role": "Required",
      "role_reason": "Material on Original access record, stored summary and external abstracts/full text/registration/plans is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on Original access record, stored summary and external abstracts/full text/registration/plans must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: External material remains unread now. A past cache failure is not converted into current paper inaccessibility, and past checks are not promoted into newly completed QA. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N32",
      "question_type": "Evidence condition",
      "question": "Are Korean/English text, empty corrections and prior calculation records preserved?",
      "needed": "Complete originals, empty correction/subclaim records and prior calculation",
      "role": "Supplementary",
      "role_reason": "Material on Complete originals, empty correction/subclaim records and prior calculation is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on Complete originals, empty correction/subclaim records and prior calculation must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: After content review, new material, corrections or verdict changes are recorded as separate events. This records needed materials; no new research was executed."
    },
    {
      "item_id": "N33",
      "question_type": "Evidence condition",
      "question": "Are original C54, axes and evidence date distinct from production?",
      "needed": "Original C54, caution, assessment axes and evidence date",
      "role": "Required",
      "role_reason": "Material on Original C54, caution, assessment axes and evidence date is needed to connect oral single-ingredient treatment, populations, comparators, urate measurement, time points, strata, denominators, precision and harms.",
      "application_exception": "Existing C54, caution, assessment axes and empty values are retained. Urate concentrations and gout attacks, placebo, active drug and drinks, within- and between-group findings, strata, periods and denominators are distinguished. No new change differences, CIs, unit conversions, attrition, incidence, unique totals or dosing guidance are created.",
      "criterion": "Original records on Original C54, caution, assessment axes and evidence date must link to the same product, population, comparator, test, time point, stratum and denominator, distinguishing within-group and between-group findings, placebo and active drug, and direct trials and pooled reviews.",
      "basis": "Existing principles distinguish questions, direct comparisons, reports and trials, endpoints, denominators, precision and harms.",
      "condition_origin": "These evidence conditions concern the existing question of oral single-ingredient vitamin C and serum urate in adults. They do not establish new preregistration, official assessment or independent clinical validation.",
      "proposed_research": "Material needed: New material, condition revisions and verdict changes are separate events after content review. The original date is not used as a current search or external reading date. This records needed materials; no new research was executed."
    }
  ]
}