Table 1.

Comparison of baseline characteristics patients before and after PSM.

	Before PSM			After PSM
	Suboptimal ovarian response (n=676)	Normal ovarian response (n=4542)	p	Suboptimal ovarian response (n=649)	Normal ovarian response (n=649)	p
Age (year)	30.00 ± 4.009	29.21 ± 3.889	0.000	29.15 ± 3.921	29 ± 4.201	0.618
BMI (kg/m2)	23.944 ± 2.543	22.900 ± 2.455	0.000	23.032 ± 2.56	23 ± 2.43	0.652
Basal FSH (IU/L)	6.848 ± 1.649	6.457 ± 1.557	0.000	6.81± 1.632	6.9 ± 1.509	0.317
Basal LH(IU/L)	6.071 ± 3.725	5.683 ± 3.326	0.050	6.011 ± 3.692	5.932 ± 3.861	0.706
Basal E2 (pmol/L)	166.272 ± 111.664	177.425 ± 166.942	0.093	168.452 ± 109.264	173.385 ± 145.758	0.490
Basal TSH(IU/L)	2.687 ± 1.589	2.889 ± 3.705	0.162	2.574 ± 1.479	2.395 ± 2.021	0.069
AMH (pmol/L)	21.972 ± 9.87	22 ± 10.10	0.282	21.874 ± 9.89	21.932 ± 9.928	0.918
Oligomenorrhea rate	425/676	2684/4575	0.000	420/649	374/649	0.000
Initial dosage of Gn (IU)	171.34 ± 30.71	190 ± 32.33	0.001	171.55 ± 30.91	170 ± 29.86	0.891
Total dosage of Gn used (IU)	3058.30 ± 1152.53	2300± 961.06	0.001	2966.62 ± 1055.73	3000 ± 1105.62	0.916
Duration of Gn used (d)	16.45 ± 2.710	13.04 ± 1.983	0.000	16.32 ± 2.50	14 ± 2.03	0.000
Cost (RMB)	14253.94 ± 3075.64	10943 ± 2067.94	0.000	13827.088 ± 2817.31	13273.478 ± 1993.05	0.231
Frist day on Gn
LH	0.751 ± 0.376	0.835 ± 0.541	0.013	0.74 ± 0.38	0.81 ± 0.38	0.022
FSH	2.323 ± 1.774	2.895 ± 1.361	0.000	2.31 ± 1.16	2.7 ± 1.29	0.001
E2	133.861 ± 67.426	145.325 ± 52.652	0.000	151.645 ± 59.329	159.542 ± 66.901	0.025
7or8 days after Gn
LH	0.494 ± 0.357	0.934 ± 1.212	0.003	0.50 ± 0.36	0.66 ± 0.47	0.009
E2	431.788 ± 212.509	1705.532 ± 1313.424	0.000	483.365 ± 292.033	1642.055 ± 1009.435	0.000
HCG injection day
LH	1.333 ± 1.445	1.410 ± 1.043	0.092	1.365 ± 1.47	1.447 ± 0.990	0.152
E2	13397.476 ± 6561.658	15418.815 ± 7206.041	0.979	14593 ± 8253.094	15021 ± 8022.038	0.883
P	4.493 ± 2.097	4.438 ± 2.378	0.853	4.391 ± 1.884	4.469 ± 2.774	0.297

Gn, gonadotropin.

BMI, Body mass index.