Vitamin A vs placebo: Adverse events: minor gastrointestinal symptoms
Vitamin A leads to higher adverse events: minor gastrointestinal symptoms compared with placebo (high certainty).
What each review found
Include earlier review versions| Finding | Effect | Studies | GRADE certainty |
|---|---|---|---|
Vitamin A vs placebo Adverse events: minor gastrointestinal symptoms · healthy people and healthy male physicians Vitamin A leads to higher adverse events: minor gastrointestinal symptoms compared with placebo (high certainty). Drugs for preventing lung cancer in healthy people (2020) · Cochrane Headline outcomes only | RR 2.22 [1.8, 2.74] | 1 study · 22071 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 | list not extracted yet | Not assessed |
Studies behind the findings
None of these reviews ties its included studies to this outcome in the data here. Cochrane reviews and reviews with headline outcomes only do not list their studies yet.
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.