It is very uncertain whether natural cycle FET changes multiple pregnancy rate per woman compared with HT FET (very low certainty).
Natural cycle FET showed no clear difference in multiple pregnancy rate per woman compared with HT plus GnRHa suppression FET (low certainty).
Day 3 showed no clear difference in multiple pregnancy rate per woman compared with day 2 embryo transfer following IVF or ICSI (moderate certainty).
It is very uncertain whether gonadotropins with GnRH agonists changes multiple pregnancy rate per couple compared with gonadotropins alone (very low certainty).
Gonadotropins with GnRH antagonist showed no clear difference in multiple pregnancy rate per couple compared with gonadotropins alone (moderate certainty).
Gonadotropins showed no clear difference in multiple pregnancy rate per couple compared with anti‐oestrogens (low certainty).
Gonadotrophins with anti‐oestrogens showed no clear difference in multiple pregnancy rate per couple compared with gonadotropins alone (low certainty).
It is very uncertain whether aromatase inhibitors changes multiple pregnancy rate per couple compared with gonadotropins (very low certainty).
Aromatase inhibitors with gonadotropins showed no clear difference in multiple pregnancy rate per couple compared with anti‐oestrogens with gonadotropins (low certainty).
Aromatase inhibitors showed no clear difference in multiple pregnancy rate per couple compared with anti‐oestrogens (low certainty).
IUI in a stimulated cycle showed no clear difference in multiple pregnancy rate per couple compared with TI or expectant management (low certainty).
IUI in a natural cycle showed no clear difference in multiple pregnancy rate per couple compared with TI or expectant management (low certainty).
IUI in a stimulated cycle showed no clear difference in multiple pregnancy rate per couple compared with IUI (low certainty).
It is very uncertain whether gradient technique changes multiple pregnancy rate per couple compared with wash and centrifugation (very low certainty).
It is very uncertain whether swim‐up technique changes multiple pregnancy rate per couple compared with wash and centrifugation (very low certainty).
IUI in stimulated cycles showed no clear difference in multiple pregnancy rate per couple compared with TI (low certainty).
It is very uncertain whether ultrasound‐guided transvaginal ovarian needle drilling with… changes multiple pregnancy rate (per woman) compared with gn (very low certainty).
Metformin showed no clear difference in multiple pregnancy rate (per woman) compared with placebo co‐treatment (low certainty).
It is very uncertain whether fresh changes multiple pregnancy rate: cumulatively compared with frozen embryo transfer (cumulatively) (very low certainty).