Table 2 Comparison of treatment-related characteristics during COH between women with or without a premature LH surge

LH on the initiation day of GnRH antagonist (mIU/mL)

15.83 ± 6.95

4.63 ± 2.38

 < 0.001*

E2 on the initiation day of GnRH antagonist (pg/ml)

2009.44 ± 979.88

1555.32 ± 1143.41

0.001

Progesterone on the initiation day of GnRH antagonist (pg/ml)

1.14 ± 0.52

0.81 ± 0.42

 < 0.001*

Total Gn dose (IU)

2362.25 ± 913.92

2534.29 ± 911.04

0.098

Endometrial thickness on HCG day (mm)

11.08 ± 1.87

10.51 ± 2.20

0.019*

LH on HCG day (mIU/mL)

2.80 ± 2.47

2.38 ± 1.77

0.125

E2 on HCG day (pg/ml)

3996.03 ± 1866.51

3205.08 ± 1637.49

 < 0.001*

Progesterone on HCG day (pg/ml)

1.13 ± 0.43

1.04 ± 0.40

0.049

Oocytes retrieved

12.18 ± 6.06

10.57 ± 5.56

0.011*

MII oocytes

8.77 ± 6.57

7.40 ± 5.69

0.036*

Fertilization rate

75.81% (840/1108)

72.51% (4898/6755)

0.022*

Good-quality embryo rate

36.15% (282/780)

39.81% (1815/4559)

0.053

Transfer cancellation rate

53.85% (49/91)

52.27% (334/639)

0.778