Table 1 Comparison between the previous IVF cycles- related variables in patients who conceived and those who did not following ZIFT

Number of cycles

47

35

12

Patients’ age (years)

33.6 ± 4.9

34.2 ± 4.8

31.9 ± 5.0

ns

Cycle rank

10.2 ± 2.9

10.2 ± 3.0

9.5 ± 3.3

ns

Cause of infertility (% of all)

 Male

64.4%

63.6%

66.6%

ns

 Oligo/anovulation

8.9%

9.1%

8.3%

ns

 Others

26.6%

27.2%

25%

ns

COH protocol (% of all)

 Long agonist

63%

62.5%

63.6%

ns

 Short agonist

11.5%

12.5%

9.1%

ns

 Antagonist

25.5%

25%

27.2%

ns

Mean number of daily gonadotropin ampoules used

3.6 ± 1.5

3.8 ± 1.6

3.1 ± 1.1

p = 0.2

Peak E2 levels on day of hCG administration (pg/ml)

1984 ± 673

1951 ± 624

1937 ± 829

ns

Number of oocytes retrieved

11.1 ± 4.0

10.7 ± 4.4

11.9 ± 6.3

ns

Fertilization rate (%)

55 ± 21

50 ± 21

55 ± 33

ns

Number of 2PN

6.3 ± 4.3

5.6 ± 3.4

8.4 ± 6.1

p = 0.06

Total number of top quality

1.4 ± 1.9

1.6 ± 2.1

1.0 ± 1.5

NS

Embryos (TQE)

Ratio of number of TQE to 2PN

24.5 ± 30.9

27.9 ± 33.7

13.9 ± 16.1

p = 0.2

Number of embryos transferred

2.9 ± 0.9

2.9 ± 1.0

3.0 ± 0.7

ns