Table 1: Clinical outcomes of frozen cycles between blastocysts vitrified on day 5 and on day 6.
	Blastocysts vitrified on day 5	Blastocysts vitrified on day 6	P
Cycles (n)	97	37
Nº embryo transferred (mean)	1.76±0.42	1.76±0.43	>0,99
HCG positive	59.80% (58/97)	54.10% (20/37)	0.85
Clinical pregnancy rate	46.40% (45/97)	40.50% (15/37)	0.68
Implantation rate	39.53% (68/172)	26.15% (17/65)	0.07
Ongoing pregnancy rate at 20 week of gestation	40.20% (39/97)	35.10% (13/37)	0.73