Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

949 questions · 1,008 findings · 130 reviews · Gynaecology and Fertility

No studies found 195 · 19.3%GRADE not reported 30 · 3%Very low 346 · 34.3%Low 323 · 32%Moderate 101 · 10%High 13 · 1.3%

Transdermal oestrogens vs oral oestrogens

Clinical pregnancy rate · women undergoing embryo transfer with frozen embryos or embryos derived from donor oocytes

Transdermal oestrogens showed no clear difference in clinical pregnancy rate compared with oral oestrogens (low certainty).

1 finding from 1 review

Starting administration of the progestogen earlier vs starting administration of the progestogen later

Clinical pregnancy rate · women undergoing embryo transfer with frozen embryos or embryos derived from donor oocytes

Starting administration of the progestogen earlier probably leads to higher clinical pregnancy rate compared with starting administration of the progestogen later (moderate certainty).

1 finding from 1 review