Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

319 questions · 326 findings · 34 reviews · Airways

No studies found 21 · 6.4%GRADE not reported 22 · 6.7%Very low 20 · 6.1%Low 81 · 24.8%Moderate 132 · 40.5%High 50 · 15.3%