Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

1,411 questions · 1,474 findings · 170 reviews

No studies found 336 · 22.8%GRADE not reported 97 · 6.6%Very low 419 · 28.4%Low 395 · 26.8%Moderate 188 · 12.8%High 39 · 2.6%

Medical/surgical masks vs no masks

Viral respiratory illness ‐ laboratory‐confirmed influenza/SARS‐CoV‐2 · general population

Medical/surgical masks showed no clear difference in viral respiratory illness ‐ laboratory‐confirmed influenza/SARS‐CoV‐2 compared with no masks (moderate certainty).

1 finding from 1 review

Antioestrogen plus medical adjunct vs antioestrogen

Clinical pregnancy · ovulation induction in polycystic ovarian syndrome

Antioestrogen plus medical adjunct showed no clear difference in clomiphene citrate plus bromocriptine versus clomiphene citrate ‐… compared with antioestrogen alone (low certainty).

1 finding from 1 review