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What do systematic reviews say?

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Evidence found and GRADE certainty

251 questions · 277 findings · 23 reviews

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No studies found 64 · 23.1%GRADE not reported 13 · 4.7%Very low 131 · 47.3%Low 59 · 21.3%Moderate 7 · 2.5%High 3 · 1.1%

Single component intervention vs control

Adverse events: number of people experiencing adverse events (all cause or COPD‐related), serious adverse events, mortality · COPD

It is very uncertain whether single component intervention changes adverse events: number of people experiencing adverse events (all… compared with control (very low certainty).

1 finding from 1 review

Medical or surgical intervention, or both, for gastro‐oesophageal reflux disease vs nil intervention, delayed intervention control, or placebo

Exacerbations: number of people experiencing moderate or severe exacerbations · treatment for asthma in adults and children with asthma and GORD

Medical or surgical intervention, or both, for gastro‐oesophageal… showed no clear difference in number of participants with moderate/severe acute exacerbations… compared with nil intervention, delayed intervention control, or placebo (low certainty).

1 finding from 1 review

Medical or surgical intervention, or both, for gastro‐oesophageal reflux disease vs nil intervention, delayed intervention control, or placebo

Lung function: FEV1 mL (change from baseline) · treatment for asthma in adults and children with asthma and GORD
1 finding from 1 review

Medical or surgical intervention, or both, for gastro‐oesophageal reflux disease vs nil intervention, delayed intervention control, or placebo

Use of "rescue" medications and emergency action plans: B2 use puffs per day Duration of treatment: range 14 weeks to 24 weeks · treatment for asthma in adults and children with asthma and GORD
1 finding from 1 review

Medical or surgical intervention, or both, for gastro‐oesophageal reflux disease vs nil intervention, delayed intervention control, or placebo

Healthcare utilisation ‐ not measured · treatment for asthma in adults and children with asthma and GORD

The review found no eligible studies for this question.

1 finding from 1 review

Psychological intervention: structured telephone call (verbal follow‐up and reassurance) vs placebo or no intervention

Patient‐reported pain intensity or pain relief (VAS, NRS or categorical scale) · People undergoing orthodontic treatment (any age; 9 to 34 years in included studies)

The review found no eligible studies for this question.

1 finding from 1 review