Table 4. GnRH antagonist versus GnRH-a (long protocol and fl are-up) : clinical pregnancy rate per cycle initiated
Trial	GnRHantagonist	GnRHagonist	%Weights	Odds ratio	95% CI
Long protocol
Cheunget al., 2005	5/31	3/32	25.5	1.85	(0.32, 13)
Marciet al., 2005	5/30	2/30	17.2	2.8	(0.40, 31.3)
D’Amato et al., 2004	18/85	6/60	57.2	2.41	(0.83, 7.9)
Pooled odds ratio = 2.34 (1.10 to 4.94)Fixed effects (Mantel-Haenszel, Robins-Breslow-Greenland) Chi2 (test odds ratio differs from 1) = 4.36 p = 0.0367Non-combinability of studiesBreslow-Day = 0.133 (df=2) p = 0.9355 Cochran Q = 0.13 (df=2) p = 0.9356