Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

3,092 questions · 3,199 findings · 339 reviews · Headline outcomes only

No studies found 714 · 22.3%GRADE not reported 181 · 5.7%Very low 695 · 21.7%Low 908 · 28.4%Moderate 568 · 17.8%High 133 · 4.2%

Summary of findings table ‐ Progestogens vs placebo or no pretreatment

Pregnancy loss · ovarian stimulation protocols for women undergoing ART

Progestogen showed no clear difference in pregnancy loss (Prog + Ag vs Ag) compared with placebo or no pretreatment (low certainty).

2 findings from 1 review

Summary of findings table ‐ Progestogens vs placebo or no pretreatment

Multiple pregnancy rate · ovarian stimulation protocols for women undergoing ART

The review found no eligible studies for this question.

2 findings from 1 review

Summary of findings table ‐ Progestogens vs placebo or no pretreatment

OHSS · ovarian stimulation protocols for women undergoing ART

The review found no eligible studies for this question.

2 findings from 1 review

Oestrogen vs no pretreatment

Live birth or ongoing pregnancy · ovarian stimulation protocols for women undergoing ART

Oestrogen showed no clear difference in live birth or ongoing pregnancy (Oestr + Ant vs Ant) compared with no pretreatment (moderate certainty).

2 findings from 1 review

Oestrogen vs no pretreatment

Pregnancy loss · ovarian stimulation protocols for women undergoing ART

It is very uncertain whether oestrogen changes pregnancy loss (Oestr + Ant vs Ant) compared with no pretreatment (very low certainty).

2 findings from 1 review

Oestrogen vs no pretreatment

Multiple pregnancy rate · ovarian stimulation protocols for women undergoing ART

The review found no eligible studies for this question.

2 findings from 1 review