Table 6.

Multivariate regression analysis of fixed and flexible protocol of GnRH antagonist.

	Before PSM			After PSM
Fixed protocol	Coefficient	t	P	Coefficient	t	P
OPU number	0.003	0.126	0.900	-0.002	-0.061	0.951
Number of usable embryos	-0.020	-0.780	0.436	0.008	0.237	0.813
Number of good quality embryos	0.029	0.968	0.333	0.039	1.037	0.300
	Wald value	95% CI	P	Wald value	95% CI	P
OHSS	0.759	0.097, 2.451	0.384	2.633	0.837, 6.637	0.105
Clinical pregnancy	0.486	0.626, 1.250	0.486	0.388	0.581, 1.325	0.877
Live birth	0.001	0.700, 1.417	0.982	3.531	0.958, 7.604	0.060
Multiple pregnancy	0.189	0.560, 2.485	0.664	2.402	0.798, 6.881	0.121
Miscarriage	2.006	0.266, 1.238	0.157	3.757	0.128, 1.012	0.053
Flexible protocol	Coefficient	t	P	Coefficient	t	P
OPU number	0.000	-0.023	0.982	-0.034	-1.444	0.149
Number of usable embryos	0.031	1.576	0.115	0.041	1.826	0.068
Number of good quality embryos	0.023	0.979	0.328	0.044	1.538	0.124
	Wald value	95% CI	P	Wald value	95% CI	P
OHSS	0.076	0.516, 1.648	0.783	0.163	0.555, 2.444	0.686
Clinical pregnancy	0.521	0.679, 1.196	0.470	0.820	0.610, 1.199	0.365
Live birth	0.296	0.695, 1.228	0.587	0.247	0.420, 1.677	0.619
Multiple pregnancy	1.273	0.783, 2.485	0.259	0.027	0.457, 1.940	0.942
Miscarriage	0.260	0.656, 2.048	0.610	0.307	0.630, 2.286	0.580

PSM, propensity score matching; OPU, oocytes pick up; OHSS, ovarian hyper-stimulation syndrome; 95% CI, 95% confidential interval.