Table 3. Factors Affecting the Zygote with Good Zygote score (Z-1): Multivariable Regression Analysis.

Variable	B	SEM	Wald	P value	Exp(B)	95% CI
Oocyte maturity	2.654	0.124	459.451	<0.0001 *	14.212	11.149,18.1115
Cohort 2PN No.	-0.597	0.129	21.444	<0.0001 *	0.551	0.428,0.709
COS protocol	-0.581	0.097	35.594	<0.0001 *	0.560	0.462,0.677
No. of cohort oocytes retrieved	0.177	0.173	1.052	0.305	1.194	0.851,1.675
Age of female (years)	-0.002	0.104	0.007	0.983	0.998	0.814,1.223
No. of cohort mature oocytes	0.262	0.167	2.467	0.116	1.300	0.937,1.803
Age of male (years)	-0.009	0.100	0.009	0.926	0.991	0.815,1.215
Body mass index (kg/m2)	-0.148	0.093	2.569	0.109	0.862	0.719,1.034
Fertilization method	0.130	0.094	1.912	0.167	1.139	0.947,1.371
Primary/second infertility	0.087	0.093	0.876	0.349	1.091	0.909,1.310
Duration of infertility (years)	-0.025	0.097	0.064	0.800	0.976	0.807,1.180
E2 (pg/mL) on hCG day	0.154	0.117	1.733	0.188	1.166	0.928,1.466
Progesterone on hCG day(ng/mL)	-0.115	0.094	1.503	0.220	0.891	0.742,1.071
E2 (pg/mL)/oocyte	-0.063	0.099	0.402	0.526	0.939	0.773,1.140
Ampoules of 75 IU FSH	-0.127	0.098	1.660	0.198	0.881	0.727,1.068
Endometrial thickness on hCG day (cm)	-0.127	0.090	1.999	0.157	0.881	0.739,1.050
Days of FSH Stimulation	-0.004	0.104	0.002	0.969	0.996	0.813,1.220

B: intercept; SEM: standard error of the mean; Wald: Wald statistic; Exp (B): adjusted odds ratio; CI: confidence interval.

* A p-value less than 0.05 was considered statistically significant