Table 3.

Developmental competence after single transfer of blastocysts vitrified using either a closed vitrification system (CVS) or an open vitrification system (OVS) (Study 3). Data are shown ± standard error

	CVS-vitrified embryos (n = 100)	OVS-vitrified embryos (n = 163)
Mean blastocyst quality score before vitrification	22.8 ± 0.9	22.3 ± 0.7
Survival rate after vitrification and warming (%)	97.0 ± 1.7 (97/100)	96.9 ± 1.4 (158/163)
Implantation rate (%)	53.6 ± 5.1 (52/97)	53.2 ± 4.0 (84/158)
Ongoing pregnancy rate (%)	45.4 ± 5.1 (44/97)	46.8 ± 4.0 (74/158)

There were no significant differences