Comparison 6. Monozygotic twinning: assisted hatching compared with no assisted hatching.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
6.1 Monozygotic twinning per woman randomised	6	729	Odds Ratio (M‐H, Fixed, 95% CI)	3.23 [0.34, 31.03]