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What do systematic reviews say?

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Evidence found and GRADE certainty

3 questions · 3 findings · 1 reviews · Airways

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No studies found 0 · 0%GRADE not reported 0 · 0%Very low 0 · 0%Low 0 · 0%Moderate 1 · 33.3%High 2 · 66.7%

Vitamin D vs placebo

Rate of exacerbations requiring systemic corticosteroids · children and adults with predominantly mild to moderate asthma

Summary of findings table ‐ Vitamin D showed no clear difference in proportion of participants with one or more exacerbations treated… compared with placebo (high certainty).

1 finding from 1 review

Vitamin D vs placebo

Patients with severe exacerbations (requiring hospitalisation or ER visit) · children and adults with predominantly mild to moderate asthma

Summary of findings table ‐ Vitamin D showed no clear difference in proportion of participants with one or more exacerbations requiring… compared with placebo (moderate certainty).

1 finding from 1 review

Vitamin D vs placebo

Proportion of participants with one or more serious adverse events due to any cause · children and adults with predominantly mild to moderate asthma

Summary of findings table ‐ Vitamin D showed no clear difference in proportion of participants with one or more serious adverse events… compared with placebo (high certainty).

1 finding from 1 review