Treatment

Oocytes (n)

Cleavage 48h-pi

n (%)

Blastocysts/oocyte

n (%)

Blastocysts/cleaved

n (%)

VS1

51

13 (25.5)^a

7 (13.7)^a

7 (53.8)

VS2

60

22 (36.7)^b

13 (21.7)^b

13 (59.1)

Control

74

30 (40.5)^b

18 (24.3)^b

18 (60.0)