Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

467 questions · 471 findings · 38 reviews · Airways

No studies found 35 · 7.4%GRADE not reported 27 · 5.7%Very low 31 · 6.6%Low 138 · 29.3%Moderate 178 · 37.8%High 62 · 13.2%

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

Intervention not reported

Non‐fatal, serious adverse pneumonia events (requiring hospital admission) · patients with chronic obstructive pulmonary disease

The intervention leads to higher non‐fatal, serious adverse pneumonia events (requiring hospital… (high certainty).

1 finding from 1 review