Question · asked by 1 review
Vitamin C vs placebo: Adverse events
- Population
- healthy male physicians, period: 1997 to 2007 and female health professionals, period: 1998 to 2005
- Intervention
- Vitamin C
- Comparison
- placebo
- Outcome
- Adverse events
What each review found
Include earlier review versions| Finding | Effect | Studies | GRADE certainty |
|---|---|---|---|
Vitamin C vs placebo Adverse events · healthy male physicians, period: 1997 to 2007 and female health professionals, period: 1998 to 2005 Drugs for preventing lung cancer in healthy people (2020) · Cochrane Headline outcomes only | no estimate extracted | 1 study · 1 participants | High |
Findings are shown side by side, never pooled across reviews.
The reviews
| Review | Searched up to | Included studies | AMSTAR 2 |
|---|---|---|---|
| Drugs for preventing lung cancer in healthy people 2020 · Cochrane Headline outcomes only | Not reported | Not extracted | Not assessed |
Related questions
The same intervention and outcome, asked in another population or against another comparator.
- Vitamin C vs placebo · people with asthma · 1 review
- Vitamin C vs placebo · adults and children with exercise‐induced bronchoconstriction/asthma · 1 review
- Vitamin C vs allopurinol · participants with chronic gout and sUA level > 0.36mmol/L · 0 reviews
How reviews are matched to this question
Reviews word the same question differently. Four decision models (TypeSafe's Jev, Liquid AI's d1-ultra, SubQ Snap and Baseten's Elephant) judged each wording of the population, intervention, comparator and outcome against the others; two wordings count as the same when at least three of them agree and none clearly disagrees, and findings count as this question only when all four elements match. Timing, setting and subgroup never split a question: they are shown on each finding.