It is very uncertain whether mechanical pressure changes clinical pregnancy rate per randomised woman compared with usual care (very low certainty).
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).
Metformin combined with clomiphene citrate probably leads to higher clinical pregnancy rate per woman compared with clomiphene citrate alone (moderate certainty).
Gonadotrophins probably leads to higher clinical pregnancy rate per woman compared with continued clomiphene citrate (moderate certainty).
Recombinant follicle stimulating hormone showed no clear difference in clinical pregnancy rate per woman compared with urinary‐derived gonadotrophins (low certainty).
It is very uncertain whether human menopausal gonadotrophin or highly purified human menopausal… changes clinical pregnancy rate per woman compared with urinary follicle stimulating hormone (very low certainty).
Metformin probably leads to higher clinical pregnancy rate per woman compared with placebo or no treatment (moderate certainty).
Clomiphene citrate or letrozole with or without gonadotropins (with… showed no clear difference in clinical pregnancy rate per woman compared with gonadotropins (with GnRH agonists or midcycle antagonist) (moderate certainty).
Clomiphene citrate or letrozole with or without gonadotropins (with… showed no clear difference in clinical pregnancy rate per woman compared with gonadotropins (with GnRH agonist or midcycle antagonist) (low certainty).
RhCG showed no clear difference in clinical pregnancy rate per woman compared with uhCG (moderate certainty).
It is very uncertain whether rhLH changes clinical pregnancy rate per woman compared with uhCG (very low certainty).
It is very uncertain whether day 3 changes clinical pregnancy rate per woman compared with day 2 embryo transfer following IVF or ICSI (very low certainty).
The intervention may leads to higher clinical pregnancy rate per woman (low certainty).
The intervention showed no clear difference in clinical pregnancy rate per woman (low certainty).
Metformin may leads to higher clinical pregnancy rate (per woman) compared with placebo co‐treatment (low certainty).
Glucocorticoid supplementation showed no clear difference in clinical pregnancy rate per woman/couple compared with placebo (low certainty).
IVF showed no clear difference in clinical pregnancy rate per woman randomised compared with IUI + ovarian stimulation with gonadotropins or CC (low certainty).
It is very uncertain whether IVF changes clinical pregnancy rate per woman randomised compared with expectant management (very low certainty).
It is very uncertain whether IVF changes clinical pregnancy rate per woman randomised compared with unstimulated IUI (very low certainty).
Summary of findings table ‐ Aspiration/flush showed no clear difference in clinical pregnancy rate per woman randomised compared with aspiration (low certainty).