Table 4.

The logistic regression analyses of factors may affect cumulate live birth rate in the female age ≥35 years group.

Variable	B	OR	95% CI	P
Female age (years)	–0.178	0.837	0.808–0.868	<0.001
Male age (years)	–0.021	0.979	0.963–0.996	0.016
Number of gonadotropin units used	0.000	1.000	1.000–1.000	<0.001
COH protocol
Long protocol	Ref	Ref	–	<0.001
Ultra-long protocol	–0.252	0.777	0.636–0.950	0.014
Short protocol	–0.665	0.514	0.396–0.667	<0.001
Antagonist protocol	–0.360	0.698	0.570–0.855	<0.001
Number of oocytes retrieved
<5	Ref	Ref	–	<0.001
5–15	0.585	1.795	1.429–2.256	<0.001
>15	0.258	1.294	0.962–1.741	0.089
Number of transferrable embryo	0.148	1.159	1.135–1.184	<0.001
Constant	6.529	684.703	–	<0.001

CI: Confidence interval; COH: Controlled ovarian hyperstimulation; OR: Odds ratio.