Table 6.

Multivariate regression analysis for clinical pregnancy.

Factors	OR	95% CI	P
Age	0.927	0.882–0.974	0.003
Endometrial thickness on the transformation day	1.088	0.955–1.240	0.203
Endometrial thickness on the blastocyst transfer day	1.021	0.917–1.137	0.705
Days of taking progynova	1.086	0.988–1.194	0.086
Estrogen level on the transformation day	1.000	0.999–1.000	0.275
Estrogen level on the blastocyst transfer day	1.000	0.999–1.000	0.246
Progesterone level on the blastocyst transfer day	1.016	0.990–1.044	0.232
Number of high-quality blastocysts transferred	1.723	1.231–2.411	0.002