Comparison 6. Blastocyst‐ versus cleavage‐stage transfer: embryo freezing rate per couple.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
6.1 Embryo freezing per couple	14	2292	Odds Ratio (M‐H, Fixed, 95% CI)	0.48 [0.40, 0.57]