Table 1 Demographic characteristics of women recruited in this study

Age (y)

30.78 ± 3.54

31.75 ± 3.10

0.349

BMI (kg/m²)

22.40 ± 3.52

21.87 ± 1.98

0.544

Basal FSH (mIU/mL)

6.28 ± 1.55

6.62 ± 1.85

0.541

Basal LH (mIU/mL)

4.20 ± 2.41

3.23 ± 1.54

0.119

Basal E2 (pg/mL)

37.08 ± 13.31

41.25 ± 18.48

0.422

Endometrial thickness on the day of embryo transfer (mm)

8.59 ± 0.38

8.43 ± 0.39

0.180

Times of embryo transfer executed

1(1, 1)

4(3, 10)

 < 0.001

Number of embryos per transfer

1.61 ± 0.50

1.64 ± 0.48

0.803

Average score of transferred day-3 embryos

7.59 ± 0.63

7.66 ± 0.71

0.630

Score of transferred blastocysts

(0/0,0%)

3BB (21/78, 27%)

4AB (30/78, 38%)

4BB (27/78, 35%)