Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

567 questions · 573 findings · 37 reviews · Headline outcomes only

No studies found 89 · 15.5%GRADE not reported 156 · 27.2%Very low 140 · 24.4%Low 127 · 22.2%Moderate 47 · 8.2%High 14 · 2.4%