Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

13 questions · 13 findings · 3 reviews · Gynaecology and Fertility

No studies found 3 · 23.1%GRADE not reported 0 · 0%Very low 2 · 15.4%Low 7 · 53.8%Moderate 1 · 7.7%High 0 · 0%

Metformin vs placebo or no treatment

Clinical pregnancy rate · women with polycystic ovary syndrome

It is very uncertain whether metformin changes clinical pregnancy rate per woman ‐ short protocol GnRH‐antagonist compared with placebo or no treatment (very low certainty).

1 finding from 1 review · compare the 2 reviews

Intervention not reported

Live birth or ongoing pregnancy Short protocol vs long protocol · subfertile women

The intervention showed no clear difference in live birth or ongoing pregnancy Short protocol vs long protocol (low certainty).

1 finding from 1 review

Long protocol vs short protocol

Ongoing pregnancy / live birth rate per woman · women undergoing pituitary suppression in assisted reproduction

Long protocol showed no clear difference in live birth or ongoing pregnancies per woman randomised compared with short protocol (low certainty).

1 finding from 1 review

Intervention not reported

Live birth/ongoing pregnancy ‐ short vs long protocol · subfertile women

The intervention showed no clear difference in live birth/ongoing pregnancy ‐ short vs long protocol (low certainty).

1 finding from 1 review

Intervention not reported

OHSS ‐ short vs long protocol · subfertile women

The review found no eligible studies for this question.

1 finding from 1 review