Table 3.

Multivariate analysis of factors related to clinical pregnancy

Factors	Day 3 ET		Day 5 ET
	OR (95 % CI)	p-value	OR (95 % CI)	p-value
Female age(years)	/	/	0.770 (0.606-0.980)	0.034
PEa, hCG day	0.874 (0.823-0.929)	<0.001	0.419 (0.237-0.742)	0.003
No. of transferred TQEs	1.073 (1.001-1.150)	0.047	1.331 (1.045-1.696)	0.021

Note: TQE: top-quality embryo; ^athree levels of PE were defined in the day 3 ET group: <1 ng/ml, 1–1.49 ng/ml, and ≥1.5 ng/ml; two levels of PE were defined in the day 5 ET group: <1.75 ng/ml and ≥1.75 ng/ml. OR: odds ratio; CI: confidence interval