Table 1.

Basic information of patients in the two groups

	Group A (n = 446)	Group B (n = 1200)	P
Maternal age (y)	29.0 ± 3.8	28.6 ± 3.2	0.05
Body mass index (kg/m2)	22.9 ± 3.3	22.7 ± 3.1	0.17
Duration of infertility (y)	3.5 ± 2.5	3.4 ± 2.5	0.35
Male age (y)	30.5 ± 4.8	29.9 ± 4.6	0.01
Type of infertility			0.47
Primary infertility	266 (59.6%)	692 (57.7%)
Secondary infertility	180 (40.4%)	508 (42.3%)
Cause of infertility			0.12
Tubal disease	248 (55.6%)	688 (57.3%)
Male factor	110 (24.7%)	297 (24.8%)
Endometriosis	62 (13.9%)	176 (14.7%)
Unexplained	26 (5.8%)	39 (3.3%)
Endometrial thickness (mm)	11.4 ± 2.3	11.3 ± 2.2	0.33
Insemination method			0.81
IVF	326 (73.1%)	870 (72.5%)
ICSI	120 (26.9%)	330 (27.5%)