Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

393 questions · 411 findings · 111 reviews

No studies found 51 · 12.4%GRADE not reported 40 · 9.7%Very low 86 · 20.9%Low 121 · 29.4%Moderate 84 · 20.4%High 29 · 7.1%

Intervention not reported

Quality of life (dyspnoea) Measured on the CRQ, the output is a number from 0 to 7, where higher on the scale is better. MID is 0.5. · adults with COPD who had exertional dyspnoea but did not fulfil the criteria for long‐term oxygen treatment

The intervention probably leads to higher quality of life (dyspnoea) Measured on the CRQ, the output is a… (moderate certainty).

1 finding from 1 review

Heliox vs oxygen 30%

Proportion of children hospitalised · children with croup

The review found no eligible studies for this question.

1 finding from 1 review

Heliox vs oxygen 30%

Length of hospital stay · children with croup

The review found no eligible studies for this question.

1 finding from 1 review