Table 1 The general data of patients in four groups

No. of cases

38

27

24

Female age(year)

33.34 ± 4.14

32.30 ± 3.83

34.13 ± 4.50

1.331

0.270

Male age (year)

35.21 ± 7.88

33.11 ± 3.11

34.67 ± 4.92

0.990

0.376

Female body mass index( kg/m²)

22.93 ± 2.81

23.76 ± 3.11

23.81 ± 2.92

0.920

0.402

Duration of infertility (year)

4.01 ± 3.58

4.41 ± 3.15

2.99 ± 2.87

1.226

0.299

Antral follicle count

6.16 ± 2.46

11.30 ± 6.72^bc

6.50 ± 3.43

12.008

P < 0.001

Basal follicle stimulating hormone (IU/L)

9.69 ± 5.02

8.20 ± 3.02

10.23 ± 4.35

1.565

0.215

Basal luteinizing hormone (IU/L)

12.91 ± 42.90

4.73 ± 2.09

4.55 ± 2.28

0.936

0.396

Main etiology of infertility (%)

 Tubal factor

52.6 (20/38)

44.4 (12/27)

70.8 (17/24)

4.623

0.099

 Diminished ovarian reserve

73.7 (28/38)

66.7 (18/27)

54.1 (13/24)

1.913

0.384

 Male factor

26.3 (10/38)

22.2 (6/27)

16.1 (4/24)

0.655

0.721

 Other factors

57.8 (22/38)

62.9 (17/27)

70.8 (17/24)

1.596

0.450

 Starting dosage of Gn

286.32 ± 72.12^a

230.56 ± 65.63

265.63 ± 49.35

4.088

0.020

 Dosage of Gn used

2806.58 ± 747.25

2467.11 ± 755.83

2818.75 ± 742.44

2.013

0.140

 Endometrial thickness on HCG injection day

8.03 ± 1.74

10.50 ± 2.29^bc

6.93 ± 1.83

23.053

P < 0.001