Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

149 questions · 155 findings · 39 reviews · Headline outcomes only

No studies found 20 · 12.9%GRADE not reported 3 · 1.9%Very low 29 · 18.7%Low 45 · 29%Moderate 52 · 33.5%High 6 · 3.9%

Intervention not reported

Number of participants requiring oral corticosteroids over the study period · Adults from minority groups with doctor diagnosed asthma

It is very uncertain whether the intervention changes number of participants requiring oral corticosteroids over the study… (very low certainty).

1 finding from 1 review

Intervention not reported

Exacerbations requiring oral corticosteroids 7.3‐month · people with asthma

The intervention showed no clear difference in exacerbations requiring oral corticosteroids 7.3‐month (low certainty).

1 finding from 1 review

Intervention not reported

Exacerbations requiring oral corticosteroids3 months · adults or children with asthma

The intervention showed no clear difference in exacerbations requiring oral corticosteroids3 months (low certainty).

1 finding from 1 review

Intermittent ICS vs placebo

Exacerbations requiring oral corticosteroids ‐ School‐age children · School‐aged children and adults

Intermittent ICS showed no clear difference in exacerbations requiring oral corticosteroids ‐ School‐age children compared with placebo (low certainty).

1 finding from 1 review

Intervention not reported

Asthma exacerbation as defined by hospital admission or treatment with a course of oral corticosteroids · participants with asthma

The review found no eligible studies for this question.

1 finding from 1 review

Intervention not reported

Asthma exacerbation as defined by hospital admission or treatment with a course of oral corticosteroids · participants with exercise‐induced asthma

The review found no eligible studies for this question.

1 finding from 1 review

Intervention not reported

Exacerbations requiring a course of oral corticosteroids · children and adolescents aged 18 years and under studies with asthma

The review found no eligible studies for this question.

1 finding from 1 review

Any ICS plus oral corticosteroid vs oral corticosteroid

Asthma relapse1at 20 to 24 days · predominantly adults with acute asthma following emergency department discharge

Any ICS plus oral corticosteroid showed no clear difference in asthma relapse1at 20 to 24 days compared with oral corticosteroid (high certainty).

1 finding from 1 review

Any ICS plus oral corticosteroid vs oral corticosteroid

Hoarseness at 20 to 24 days · predominantly adults with acute asthma following emergency department discharge

Any ICS plus oral corticosteroid showed no clear difference in hoarseness at 20 to 24 days compared with oral corticosteroid (moderate certainty).

1 finding from 1 review

Formoterol vs short‐acting beta2‐agonist

Exacerbations requiring oral corticosteroids ‐ adults · people with asthma

Formoterol probably leads to lower patients with an exacerbation requiring a course of oral… compared with short‐acting beta2‐agonist (moderate certainty).

1 finding from 1 review