Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

407 questions · 412 findings · 45 reviews · Headline outcomes only

No studies found 137 · 33.3%GRADE not reported 8 · 1.9%Very low 129 · 31.3%Low 88 · 21.4%Moderate 47 · 11.4%High 3 · 0.7%

Saline vs carbon dioxide

Adverse events and complications · women undergoing outpatient hysteroscopy

Saline probably leads to lower adverse events and complications compared with carbon dioxide (moderate certainty).

1 finding from 1 review