Table 4.

Regression analysis of factors for the prediction of a cumulative live birth for the fresh plus all frozen embryo transfer cycles.

Factors predicting a cumulative live birth	Coefficient(B)	S.E	Wald (χ2)	P value	Hazard ratio (95% CI)
Maternal age	− 0.135	0.039	11.877	0.001	0.874 (0.809–0.943)
Type of infertility
Primary infertility					1
Secondary infertility	− 0.052	0.198	0.069	0.794	0.949 (0.644–1.400)
Infertility duration	0.000	0.022	0.000	0.988	1.000 (0.958–1.043)
Cycle number
The first cycle					1
The second cycle	0.084	0.200	0.175	0.676	1.087 (0.734–1.610)
Treatment protocol
GnRHa					1
CC cotreatment	0.388	0.201	3.725	0.084	1.475 (0.994–2.187)
Body mass index	0.000	0.000	0.160	0.689	1.000 (1.00–1.00)
Basal FSH	0.026	0.035	0.545	0.461	1.026 (0.958–1.098)
AMH	0.116	0.041	18.77	< 0.001	1.112 (1.017–1.431)
Total Gn dosage	0.000	0.000	0.570	0.450	1.000 (1.00–1.00)
Days of stimulation	− 0.106	0.073	2.102	0.147	0.900 (0.780–1.038
No. of oocytes retrieved	0.023	0.020	1.378	0.240	1.023 (0.985–1.063)
No. of available embryos	0.352	0.050	50.517	< 0.001	1.422 (1.290–1.567)
Cause of infertility
Tubal					1
Male factor	0.439	0.307	2.043	0.153	1.551 (0.850–2.830)
Anovulatory	− 0.460	0.456	1.017	0.313	0.631 (0.258–1.543)
Unexplained	0.087	0.210	0.173	0.678	1.091 (0.723–1.657)
Diminished ovarian reserve	0.055	0.308	0.032	0.857	1.057 (0.578–1.933)
Endometriosis	0.371	0.420	0.782	0.376	1.449 (0.637–3.298)
Mixed	0.689	0.741	0.865	0.352	1.991 (0.466–8.506)

CC cotreatment clomiphene citrate and gonadotropin cotreatment, GnRHa gonadotropin-releasing hormone agonist, FSH follicle-stimulating hormone, AMH anti-müllerian hormone, Gn gonadotropin, CI confidence interval.