Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

3,092 questions · 3,199 findings · 339 reviews · Headline outcomes only

No studies found 714 · 22.3%GRADE not reported 181 · 5.7%Very low 695 · 21.7%Low 908 · 28.4%Moderate 568 · 17.8%High 133 · 4.2%

Intervention not reported

Mortality (deaths during trial period) · adults (> 18 years of age) with either COPD or recurrent acute exacerbations of chronic bronchitis

It is very uncertain whether the intervention changes mortality (deaths during trial period) (very low certainty).

1 finding from 1 review

Intervention not reported

Antibiotic prescriptions (number of courses/person/year) **Corticosteroids not meta‐analysed · adults (> 18 years of age) with either COPD or recurrent acute exacerbations of chronic bronchitis

The intervention may leads to higher antibiotic prescriptions (number of courses/person/year)… (low certainty).

1 finding from 1 review

Intervention not reported

Adverse events (number of adverse events/person/year) · adults (> 18 years of age) with either COPD or recurrent acute exacerbations of chronic bronchitis

The intervention showed no clear difference in adverse events (number of adverse events/person/year) (low certainty).

1 finding from 1 review

Azoles vs placebo

Adverse events · participants with confirmed toenail onychomycosis

Azole showed no clear difference in adverse events compared with placebo (moderate certainty).

1 finding from 1 review