Table 1.

Baseline and cycle characteristics among patients with PCOS.

Parameter	BMI<24 kg/m2 (N = 1339)	BMI≥24 kg/m2 (N = 1029)	P-value
Maternal age (years)	29.0 (27.0, 32.0)	30.0 (27.0, 33.0)	<0.001
Paternal age (years)	30.0 (28.0, 33.0)	31.0 (28.0, 34.0)	<0.001
Duration of infertility (years)	3.0 (2.0, 4.0)	3.0 (2.0, 5.0)	<0.001
Type of infertility (%)			<0.001
Primary infertility	55.3 (741/1339)	45.2 (465/1029)
Secondary infertility	44.7 (598/1339)	54.8 (564/1029)
Basal serum FSH level (IU/L)	6.7 (5.6, 7.8)	6.4 (5.4, 7.5)	<0.001
AMH (ng/ml)	4.1 (2.7, 6.4)	4.0 (2.7, 6.6)	0.95
Basal antral follicle count	19 (15, 24)	21 (15, 24)	<0.001
Dosage of gonadotropins (IU)	1950.0 (1500.0, 2625.0)	2562.0 (1950.0, 3300.0)	<0.001
Duration of ovarian stimulation (days)	13 (12, 14)	13 (12, 15)	<0.001
No. of oocytes retrieved	15 (12, 19)	15 (11, 18)	0.01
No. of 2PN	10 (7, 13)	10 (6, 13)	0.45
No. of available embryos	8 (5, 11)	8 (5, 11)	0.74
Endometrial thickness on the trigger day (mm)	11.0 (10.0, 13.0)	11.7 (10.0, 13.0)	0.01
OHSS rate (%)	6.2 (83/1339)	3.1 (32/1029)	0.001
Fertilization method (%)			0.045
IVF	73.0 (977/1339)	76.6 (788/1029)
ICSI	27.0 (362/1339)	23.4 (241/1029)
Stage of embryo transfer (%)			0.57
Cleavage embryo	50.3 (674/1339)	51.5 (530/1029)
Blastocyst	49.7 (665/1339)	48.5 (499/1029)
No. of embryo transfers (%)			0.97
1	54.9 (735/1339)	54.8 (564/1029)
2	45.1 (604/1339)	45.2 (465/1029)
Neonatal birth weight (g)	3300.0 (3050.0, 3600.0)	3500.0 (3150.0, 3800.0)	<0.001
Gestational weeks at delivery (weeks)	39 (38, 40)	39 (38, 40)	0.01
Gender of newborn (%)			0.62
Male	56.6 (758/1339)	55.6 (572/1029)
Female	43.4 (581/1339)	44.4 (457/1029)

The data are presented as medians (P25, P75) for continuous variables and %(n/N) for categorical variables.