Influenza vaccine vs placebo: Influenza‐like illness
Influenza vaccine probably leads to lower influenza‐like illness compared with placebo (moderate certainty).
What each review found
Current versions only| Finding | Effect | Studies | GRADE certainty |
|---|---|---|---|
Influenza vaccine vs placebo Influenza‐like illness · people aged over 65 years Influenza vaccine probably leads to lower influenza‐like illness compared with placebo (moderate certainty). Vaccines for preventing influenza in the elderly (2018) · Cochrane Headline outcomes only | RR 0.59 [0.47, 0.73] | 4 studies · 6894 participants | Moderate |
Findings are shown side by side, never pooled across reviews.
The reviews
| Review | Searched up to | Included studies | AMSTAR 2 |
|---|---|---|---|
| Vaccines for preventing influenza in the elderly 2018 · 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.