Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

4,815 questions · 6,211 findings · 638 reviews · Headline outcomes only

No studies found 1,052 · 16.9%GRADE not reported 441 · 7.1%Very low 1,700 · 27.4%Low 1,651 · 26.6%Moderate 1,070 · 17.2%High 297 · 4.8%

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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

Live birth rate · women undergoing embryo transfer with frozen embryos or embryos derived from donor oocytes

The review found no eligible studies for this question.

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