Cryopreservation showed no clear difference in moderate and or severe OHSS compared with fresh embryos transfer (low certainty).
Cryopreservation showed no clear difference in clinical pregnancies compared with fresh embryos transfer (low certainty).
Cryopreservation showed no clear difference in number of livebirths (livebirth rate) compared with fresh embryos transfer (low certainty).
It is very uncertain whether cryopreservation changes moderate and or severe OHSS compared with intra‐venous albumin (very low certainty).
Cryopreservation showed no clear difference in nil and or mild OHSS compared with intra‐venous albumin (low certainty).
Cryopreservation showed no clear difference in clinical pregnancies compared with intra‐venous albumin (low certainty).
The review found no eligible studies for this question.
Vitrification showed no clear difference in ongoing pregnancy rate compared with slow freezing (low certainty).
Vitrification probably leads to higher clinical pregnancy rate compared with slow freezing (moderate certainty).
The review found no eligible studies for this question.