Assisted hatching of vitrified-warmed blastocysts prior to embryo transfer does not improve pregnancy outcomes

Table 3 Comparisons of pregnancy outcomes for vitrified-warmed blastocyst transfers

	Assisted Hatched (n = 1986)	Non-Assisted Hatched (n = 179)	aRRª (95% CI)	P-value
Conception Rate	38.7% (768)	42.1% (75)	0.90 (0.59–1.36)	0.35
Implantation Rate	26.2%	27.3%	–	0.76
Clinical Pregnancy Rate	29.1% (576)	30.3% (54)	0.93 (0.54–1.60)	0.34
Clinical Pregnancy Loss Rate	24.0% (121)	17.8% (8)	1.39 (0.34–5.66)	0.34
Live Birth Rate	19.9% (383)	20.5% (35)	0.98 (0.49–1.96)	0.46
Monozygotic Twinning Rate	2.1% (8)	2.9% (1)	0.49 (0.004–55.76)	0.55

ªThe adjusted RRs were from generalized estimated equations (GEE) adjusted for patient clinical characteristics and woman cluster-level (multiple rounds of embryo transfer in the same patient) variation

ISSN: 1757-2215