Table 2 Ovarian induction and ICSI parameters

Dose of gonadotropin (number of ampoules)

36.4 (11.2)

34.1 (9.7)

0.1

Days of gonadotropin injection (stimulation days)

12.9 (1.9)

11.2 (2.0)

< 0.001

Triggering day (day of HCG injection)

14.4 (2.0)

13.2 (2.0)

< 0.001

 Fixed

24 (24)

66 (67)

< 0.001

 Step up

77 (76)

25 (25)

 Step down

0 (0)

8 (8)

Endometrium thickness in mm

9.5 (1.77)

11.8 (1.9)

< 0.001

Estradiol (E2) level at triggering day

2371.9 (898.51)

3168.1 (1541.9)

< 0.001

Number of oocytes retrieved

10.7 (6.05)

13.6 (5.5)

< 0.001

Mature oocytes (M2)

7.4 (3.69)

8.4 (3.3)

0.0499

Less mature oocytes (M1)

1.7 (1.54)

2.6 (1.6)

< 0.001

Germinal vesicles (GV) or immature oocytes

1.4 (1.96)

2.1 (2.2)

0.014

Empty zona (EZ)

0.3 (0.85)

0.1 (0.7)

0.1

Number of fertilized oocytes

6.2 (3.09)

6.3 (2.5)

0.6

AFC after LOD

12.4 (3.4)

16.5 (5.2)

< 0.001

AMH after LOD

2.1 (1.3)

2.8 (0.8)

< 0.001

Number of embryos cleaved

5.4 (2.8)

4.3 (2.0)

0.002

Grade 1 embryos

4.3 (2.3)

3.0 (1.3)

< 0.001

Grade 2 embryos

0.7 (0.9)

1.2 (1.0)

0.001

Grade 3 embryos

0.3 (0.6)

0.3 (0.5)

0.8

Number of embryos transferred

3.3 (1.0)

3.1 (1.5)

0.3

Day of embryo transfer (usually day 3)

3.0 (0.4)

2.7 (1.0)

0.049

Number of embryos ready for freezing

1.2 (1.9)

0.8 (1.6)

0.1