Table 2 Characteristics of the fresh embryo transfer cycles

No. of cycles

293

879

Female age (year)

30.91 ± 5.19

30.98 ± 4.53

0.838

Male age (year)

32.69 ± 6.15

32.65 ± 5.11

0.907

Female BMI (kg/m²)

22.86 ± 3.31

22.85 ± 3.47

0.947

Infertility factor, n (%)

0.813

 Ovulatory disorder

74 (25.26%)

221 (25.14%)

 Diminished ovary reserve

38 (12.97%)

136 (15.47%)

 Pelvic and tubal disease

106 (36.18%)

292 (33.22%)

 Endometriosis

16 (5.46%)

52 (5.92%)

 Male factor

59 (20.14%)

178 (20.25%)

Infertility type, n (%)

0.973

 Primary infertility

173 (59.04%)

520 (59.16%)

 Secondary infertility

120 (40.96%)

359 (40.84%)

Basal FSH (IU/L)

6.71 (5.74, 7.77)

6.53 (5.58, 7.88)

0.448

Basal LH (IU/L)

4.93 (3.48, 6.50)

4.93 (3.36, 6.92)

0.696

AFC

16.00 (10.00, 20.00)

14.00 (8.00, 22.00)

0.259

Fertilization type, n (%)

0.972

 IVF

193 (65.87%)

580 (65.98%)

 ICSI

100 (34.13%)

299 (34.02%)

E2 on trigger Day (pg/ml)

2438.50 (1654.00, 3297.00)

2151.00 (1467.00, 3119.00)

0.016

LH on trigger Day (IU/L)

2.95 (1.91, 4.56)

2.34 (1.36, 3.95)

 < 0.001

P on trigger Day (ng/ml)

1.20 (0.63, 2.96)

0.76 (0.50, 1.12)

 < 0.001

Follicle counts on trigger Day

12.00 (9.00, 15.00)

11.00 (7.00, 15.00)

0.016