Comparison 6. Letrozole compared to anastrozole.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Ovarian hyperstimulation syndrome rate	1		Risk Difference (M‐H, Fixed, 95% CI)	Totals not selected
2 Clinical pregnancy rate	2	260	Odds Ratio (M‐H, Fixed, 95% CI)	0.85 [0.51, 1.43]
3 Miscarriage rate by woman randomised	1		Odds Ratio (M‐H, Fixed, 95% CI)	Totals not selected
4 Miscarriage rate by pregnancies	1		Odds Ratio (M‐H, Fixed, 95% CI)	Totals not selected
5 Multiple pregnancy rate	2	260	Odds Ratio (M‐H, Fixed, 95% CI)	5.0 [0.24, 105.35]