Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

1,266 questions · 1,314 findings · 160 reviews · Headline outcomes only

No studies found 309 · 23.5%GRADE not reported 34 · 2.6%Very low 356 · 27.1%Low 393 · 29.9%Moderate 187 · 14.2%High 35 · 2.7%

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