Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

529 questions · 535 findings · 63 reviews · Airways

No studies found 41 · 7.7%GRADE not reported 28 · 5.2%Very low 35 · 6.5%Low 151 · 28.2%Moderate 204 · 38.1%High 76 · 14.2%

Intervention not reported

Mortality, due to pneumonia · patients with chronic obstructive pulmonary disease

It is very uncertain whether the intervention changes mortality, due to pneumonia (very low certainty).

1 finding from 1 review

Intervention not reported

Non‐fatal, serious adverse events (all) · patients with chronic obstructive pulmonary disease

The intervention showed no clear difference in non‐fatal, serious adverse events (all) (moderate certainty).

1 finding from 1 review