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What do systematic reviews say?

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Evidence found and GRADE certainty

4,703 questions · 15,007 findings · 1,416 reviews

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No studies found 2,881 · 19.2%GRADE not reported 1,551 · 10.3%Very low 3,111 · 20.7%Low 3,881 · 25.9%Moderate 2,669 · 17.8%High 914 · 6.1%

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Pregabalin 300 mg vs placebo

Patient satisfaction with analgesia ‐ not reported · women having medical abortion before 14 weeks' gestation

Summary of findings table ‐ Pregabalin 300 mg showed no clear difference in patient satisfaction with analgesia compared with placebo (low certainty).

1 finding from 1 review

Pregabalin 300 mg vs placebo

Patient satisfaction with abortion care overall ‐ not reported · women having medical abortion before 14 weeks' gestation

Summary of findings table ‐ Pregabalin 300 mg showed no clear difference in patient satisfaction with abortion care overall compared with placebo (low certainty).

1 finding from 1 review

Short‐acting inhaled beta‐2 agonists vs placebo

Number of exacerbations(as reported by number of hospitalisations and number of courses and days on antibiotics) · adults and children with cystic fibrosis

It is very uncertain whether short‐acting inhaled beta‐2 agonists changes number of exacerbations(as reported by number of hospitalisations… compared with placebo (very low certainty).

1 finding from 1 review

Short‐acting inhaled beta‐2 agonists vs placebo

Participant‐reported symptom score: cough, wheeze and exercise tolerance · adults and children with cystic fibrosis

It is very uncertain whether short‐acting inhaled beta‐2 agonists changes participant‐reported symptom score: cough, wheeze and exercise… compared with placebo (very low certainty).

1 finding from 1 review