GI (Vitamin D group) (n =40)

GII (Placebo group)

(n =40)

P value

Duration of stimulation (days), mean ± SD

13.4 ± 1.3

13.6 ± 1.6

>0.05

Dose of gonadotrophins (IU), mean ± SD

3982.1 ± 1371.9

4070.3 ± 1393.7

>0.05

N. of oocytes retrieved, mean ± SD

12.3 ± 1.4

13.6 ± 1.7

>0.05

Endometrial thickness, mean ± SD

10.2 ± 2.4

10.7 ± 2.9

>0.05

Fertilization rate, n (%)

87.6%

85.9%

>0.05

Embryo quality, n (%)

A & B

C & D

73.4%

26.6%

77.1%

22.9%

>0.05