Table 2 Ovarian stimulation outcomes in three groups

Gn initial dosage, IU

273.31 ± 67.41

286.84 ± 95.44

293.31 ± 82.89

Duration of Gn stimulation, d

8.98 ± 2.01

9.39 ± 2.55

8.59 ± 2.25

Total dosage of Gn per cycle, IU

2438.92 ± 788.71

2807.23 ± 935.16

2654.73 ± 811.35

Average transfer endometrial thickness, mm

9.67 ± 1.52

9.64 ± 2.17

10.17 ± 1.96

Oocytes MII retrieved, n

19.92 ± 7.12^a

9.47 ± 6.32^b

12.32 ± 9.19^c

High-quality embryo rate

39.10 ± 26.10

35.12 ± 29.74

36.40 ± 28.72

Cycle of transfer

 Fresh embryo transfer cycle

30 (28.0)

43 (44.8)^a

19 (27.9)^b

 Frozen-thawed embryo transfer cycle

77 (72.0)

53 (55.2)

49 (72.1)

Protocol of ovary stimulation

 Short protocol

3 (4.9)

4 (6.8)

4 (9.5)

 Long protocol

40 (65.6)

33 (55.9)

27 (64.3)

 GnRH-A protocol

18 (29.5)

19 (32.2)

10 (23.8)

 Natural-cycle protocol

0 (0)

3 (5.1)

1 (2.4)

Endometrium preparation protocol

 Natural-cycle

64 (83.1)

42 (79.2)

38 (76.7)

 HRT

13 (16.9)

11 (20.8)

11 (22.4)

Patients undergoing embryo transfer

 Cleavage transfer rate

98(91.6)

88(91.7)

58 (85.3)

 Blastocyst transfer rate

9 (8.4)

7 (7.3)

10 (14.7)

 Sequential transfer rate

0 (0)

1 (1.1)

0 (0)

High-quality embryo transferred rate

84 (78.5)

65 (67.7)

46 (67.6)

No. of embryos transferred, n

1.77 ± 0.47

1.74 ± 0.57

1.66 ± 0.51

Average transfer times to live birth, times

1 (1,2)

2 (1,2)

1 (1,1)^c