It is very uncertain whether the intervention changes clinical pregnancy rate (very low certainty).
Blastocyst‐stage may leads to lower cumulative pregnancy rate (slow freezing) compared with cleavage‐stage embryo transfer (low certainty).
Blastocyst‐stage probably leads to higher cumulative pregnancy rate (vitrification) compared with cleavage‐stage embryo transfer (moderate certainty).
Blastocyst‐stage probably leads to higher clinical pregnancy rate compared with cleavage‐stage embryo transfer (moderate certainty).
Blastocyst‐stage showed no clear difference in multiple pregnancy rate compared with cleavage‐stage embryo transfer (low certainty).
Summary of findings table ‐ Aspiration/flush showed no clear difference in clinical pregnancy rate per woman randomised compared with aspiration (low certainty).
It is very uncertain whether glucocorticoids changes incidence of ectopic pregnancies per couple compared with no glucocorticoids or placebo (very low certainty).
It is very uncertain whether glucocorticoids changes incidence of multiple pregnancies per couple compared with no glucocorticoids or placebo (very low certainty).
It is very uncertain whether glucocorticoids changes ongoing pregnancy rate per couple compared with no glucocorticoids or placebo (very low certainty).
Glucocorticoids showed no clear difference in clinical pregnancy rate per couple –pregnancy rate per couple… compared with no glucocorticoids or placebo (low certainty).
It is very uncertain whether glucocorticoids changes clinical pregnancy rate per couple – subgroup IVF compared with no glucocorticoids or placebo (very low certainty).
It is very uncertain whether glucocorticoids changes clinical pregnancy rate per couple – subgroup ICSI compared with no glucocorticoids or placebo (very low certainty).
Antioxidants may leads to higher clinical pregnancy rate per couple randomised compared with placebo or no treatment (low certainty).
It is very uncertain whether letrozole changes multiple pregnancy rate compared with laparoscopic ovarian drilling (very low certainty).
Letrozole with or without adjuncts leads to higher clinical pregnancy rate compared with SERMs with or without adjuncts followed by timed intercourse (high certainty).
Letrozole with or without adjuncts showed no clear difference in miscarriage rate per pregnancy compared with SERMs with or without adjuncts followed by timed intercourse (high certainty).
Letrozole with or without adjuncts showed no clear difference in multiple pregnancy rate compared with SERMs with or without adjuncts followed by timed intercourse (high certainty).
Letrozole showed no clear difference in clinical pregnancy rate compared with laparoscopic ovarian drilling (low certainty).
Letrozole showed no clear difference in miscarriage rate per pregnancy compared with laparoscopic ovarian drilling (low certainty).
Progesterone may leads to higher clinical pregnancy rate compared with placebo/no treatment (low certainty).