Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

660 questions · 679 findings · 99 reviews · Headline outcomes only

No studies found 160 · 23.6%GRADE not reported 17 · 2.5%Very low 199 · 29.3%Low 189 · 27.8%Moderate 97 · 14.3%High 17 · 2.5%