Table 2.

Transfer rates per initiated warming cycle when embryos were cryopreserved by vitrification Irvine, vitrification Vitrolife and slow-freezing methods

	Vitrification Irvine	Vitrification Vitrolife	Slow-freezing
Initiated warming cycles	255	261	260
Transfer rate per initiated warming cycle	86.3 % a,c	77.4 % b,c	61.1 % a, b
Mean number of embryos transferred	1.2 ± 0.4	1.2 ± 0.5	1.1 ± 0.4

Data were compared between groups. P-values: a vs a <0.001; b vs b <0.001; c vs c <0.05)