Table 1 Characteristics of oocyte retrieval cycles

No. of cycles

884

2652

Female age (year)

30.68 ± 5.24

30.70 ± 4.58

0.922

Male age (year)

32.62 ± 6.24

32.64 ± 5.32

0.928

Female BMI (kg/m²)

22.57 ± 3.03

22.62 ± 3.38

0.717

Infertility factor, n (%)

0.817

 Ovulatory disorder

227 (25.68%)

705 (26.58%)

 Diminished ovary reserve

99 (11.20%)

323 (12.18%)

 Pelvic and tubal disease

336 (38.01%)

987 (37.22%)

 Endometriosis

65 (7.35%)

173 (6.52%)

 Male factor

157 (17.76%)

464 (17.50%)

Infertility type, n (%)

0.768

 Primary infertility

506 (57.24%)

1533 (57.81%)

 Secondary infertility

378 (42.76%)

1119 (42.19%)

Basal FSH (IU/L)

6.48 (5.48, 7.60)

6.26 (5.32, 7.52)

0.012

Basal LH (IU/L)

4.87 (3.50,6.69)

5.01 (3.50,7.22)

0.121

Basal AFC

18.00 (11.50, 20.00)

16.00 (9.00, 23.00)

0.143

Fertilization type, n (%)

0.984

 IVF

586 (66.29%)

1759 (66.33%)

 ICSI

298 (33.71%)

893 (33.67%)

E2 on trigger Day (pg/ml)

3475.50 (2113.00,5012.00)

2973.00 (1815.00,5062.00)

0.002

LH on trigger Day (IU/L)

2.67 (1.75,3.93)

2.40 (1.35,3.95)

 < 0.001

P on trigger Day (ng/ml)

1.95 (0.80,3.76)

1.01 (0.64,1.62)

 < 0.001

Follicle counts on trigger Day

15.00 (11.00,20.00)

14.00 (8.00,19.00)

 < 0.001