Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

360 questions · 370 findings · 102 reviews · Headline outcomes only

No studies found 48 · 13%GRADE not reported 12 · 3.2%Very low 76 · 20.5%Low 121 · 32.7%Moderate 84 · 22.7%High 29 · 7.8%

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

Heliox vs oxygen 30%

Proportion of children intubated · children with croup

The review found no eligible studies for this question.

1 finding from 1 review

Heliox vs oxygen 30%

Duration of intubation · children with croup

The review found no eligible studies for this question.

1 finding from 1 review

Heliox vs oxygen 30%

Proportion of children re‐presenting for medical care for ongoing croup symptoms (return to care) · children with croup

The review found no eligible studies for this question.

1 finding from 1 review

Heliox vs oxygen 30%

Adverse events · children with croup

The review found no eligible studies for this question.

1 finding from 1 review