Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

461 questions · 475 findings · 59 reviews · Headline outcomes only

No studies found 112 · 23.6%GRADE not reported 13 · 2.7%Very low 66 · 13.9%Low 140 · 29.5%Moderate 112 · 23.6%High 32 · 6.7%