Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

216 questions · 217 findings · 91 reviews · Headline outcomes only

No studies found 202 · 93.1%GRADE not reported 13 · 6%Very low 1 · 0.5%Low 1 · 0.5%Moderate 0 · 0%High 0 · 0%