Table 3 Comparison between: Group 1 (patients with P ≦ 1.0 ng/ml), Group 2 (patients with P between 1.0 ng/ml to 1.25 ng/ml) and Group 3 (patients with P ≥ 1.25 ng/ml)

Patient demographics

 N

854

440

162

252

 Age (y)

31.99 ± 4.32

31.82 ± 4.29

32.02 ± 4.12

32.25 ± 4.50

NS

 BMI (kg/m²)

23.67 ± 3.85

24.13 ± 3.40

23.42 ± 3.43

23.67 ± 3.85

0.001**^a

 Duration of infertility (y)

3.39 ± 2.38

3.44 ± 2.46

3.56 ± 2.60

3.21 ± 2.05

NS

 Basal FSH (IU/L)

6.80 ± 1.61

6.85 ± 1.65

6.51 ± 1.57

6.90 ± 1.54

0.034*^b

Treatment protocol and outcomes

 Duration of stimulation (days)

11.64 ± 2.49

11.70 ± 2.61

11.57 ± 2.48

11.58 ± 2.26

NS

 Total gonadotropin (IU)

2662.23 ± 1087.50

2668.16 ± 1140.31

2629.49 ± 1108.43

2672.92 ± 977.73

NS

 Peak estradiol (pg/ml)

2751.16 ± 1165.52

2527.78 ± 1086.78

2872.97 ± 1107.16

3062.86 ± 1252.98

< 0.001**^a

 luteinizing hormone on HCG day (IU/L)

1.80 ± 2.16

1.72 ± 2.33

1.91 ± 1.50

1.88 ± 2.20

NS

 No.of oocytes retrieved

9.86 ± 3.32

9.45 ± 3.30

9.70 ± 3.15

10.66 ± 3.34

< 0.001**^c

 2PN fertilization rate (%)

63.19 ± 23.57

66.32 ± 20.32

63.18 ± 20.93

63.78 ± 21.16

NS

 High quality embryo rate (%)

29.66 ± 28.57

29.79 ± 27.95

29.51 ± 29.13

29.54 ± 29.38

NS

 Clinical pregnancy rate (%)

55.86(477/854)

55.68(245/440)

58.64(95/162)

54.37(137/252)

NS

 Live birth rate (%)

42.04(359/854)

42.28(186/440)

44.45(72/162)

40.08(101/252)

NS

 Premature rate (%)

7.73(66/854)

6.36(28/440)

9.26(15/162)

9.13(23/252)

NS

 Full-term delivery (%)

34.31(293/854)

35.91(158/440)

35.19(57/162)

30.95(78/252)

NS