Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

171 questions · 174 findings · 83 reviews · Headline outcomes only

No studies found 85 · 48.9%GRADE not reported 19 · 10.9%Very low 28 · 16.1%Low 34 · 19.5%Moderate 7 · 4%High 1 · 0.6%