Table 1 Baseline characteristics of the patients

Age (years)

30.13 ± 2.76

30.62 ± 2.62

30.36 ± 2.68

30.22 ± 2.78

 < 0.001^a,d,e*

Infertility duration (years)

2.7 ± 1.88

2.96 ± 2.16

3.19 ± 2.15

3.82 ± 2.6

 < 0.001^a,b,c,d,e,f

BMI(kg/m2)

17.58 ± 0.78

21.21 ± 1.48

25.64 ± 1.12

30.54 ± 2.27

 < 0.001^a,b,c,d,e,f

AFC

8.6 ± 4.51

9.31 ± 5.04

10.35 ± 5.64

12.2 ± 6.48

 < 0.001^a,b,c,d,e,f

AMH(ng/ml)

2.29 ± 2.2

2.42 ± 2.57

2.7 ± 2.63

2.9 ± 2.63

 < 0.001^b,c,d,e

Basal serum FSH level (mIU/ml)

8.48 ± 4.17

7.51 ± 3.7

6.99 ± 7.27

6.4 ± 2.38

 < 0.001^a,b,c,d,e,f

Basal serum E2 level (pmol/L)

175.05 ± 78.28

164.4 ± 86.21

166.91 ± 83.29

176.24 ± 83.03

0.001^a,e,f

Basal serum LH level (mIU/ml)

5.24 ± 13.04

3.97 ± 2.9

3.8 ± 3.9

3.83 ± 3.09

 < 0.001^a,b,c

Infertility cause n (%)

 < 0.001

Tubal

205 (39.6)

1333(38.7)

538 (39.6)

235 (35.8)

0.412

Male

149 (28.76)

995 (28.87)

370 (27.21)

156 (23.78)

0.054

Multiple

151 (29.2)

956 (27.7)

333 (24.5)

164 (25.0)

0.051

PCOS

13(2.5)

163(4.7)

119(8.8)

101(15.4)

 < 0.001^b,c,d,e,f