Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

322 questions · 329 findings · 31 reviews · Headline outcomes only

No studies found 90 · 27.4%GRADE not reported 52 · 15.8%Very low 80 · 24.3%Low 63 · 19.1%Moderate 38 · 11.6%High 6 · 1.8%