Fresh or frozen day 6 blastocyst transfer: is there still a question?

Table 3 Prognosis factors of live birth

	Multiple logistic regression analysis
Parameters*	Odds ratio	95% CI	p-value
Age at retrieval (y.o.)	0.91	0.86–0.96	0.002
Frozen versus fresh ET	2.54	1.05–6.17	0.038
Tubal factor	0.92	0.50–1.68	0.773
Endometriosis factor	0.94	0.59–1.48	0.773
Top- or good-quality embryo transfer^a	3.85	2.00–7.45	< 0.001
AMH level ng/mL	0.974	0.87–1.09	0.974
IVF/ICSI rank	0.838	0.66–1.06	0.140
Endometrium thickness	0.930	0.82–1.05	0.242

y.o., years old; AMH, anti-Müllerian hormone; ET = Embryo transfer, IVF/ICSI, in vitro fertilization/intracytoplasmic sperm injection
* Variables included in the multiple logistic regression model
^a A top- and good-quality embryo were defined as (B3 AA, B4 AA, and B5 AA) and (B3 AB/BA/BB, B4 AB/BA/BB, and B5 AB/BA/BB), respectively

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