Table 3.

Multivariate analysis: odds of embryo survival

	Did not survive warming	Odds ratio	95% confidence interval	p value
Year of cycle
Before 2015   2015 and after	5.2% (43/833) 2.5% (132/5334)	Before 2015 vs. after 2015: 0.52	0.30–0.91	0.02
Day of embryo development
5   6   7	1.9% (66/3560) 3.9% (93/2412) 8.2% (16/195)	D7 vs. D5: 0.57 D7 vs. D6: 0.65	0.24–1.33 0.30–1.42	0.19 0.28
Number of TE biopsy
1   2	2.7% (163/6020) 8.2% (12/147)	2 vs. 1: 0.31	0.14–0.66	0.003
Expansion grade
4   5   6	1.7% (51/3031) 2.2% (52/2321) 9.0% (72/804)	6 vs. 4: 0.34 6 vs. 5: 0.34	0.20–0.60 0.20–0.58	< 0.001  < 0.001
ICM grade
A   B   C	2.6% (104/3996) 2.6% (44/1679) 5.5% (27/487)	C vs. A: 0.58 C vs. B: 0.69	0.32–1.04 0.37–1.29	0.07 0.24