2.

Multivariate logistic analysis

Variables	Estimate	SE	χ2	OR	95% CI	P
E2, serum concentration of estradiol; FSH, follicle-stimulating hormone; SE, standard error; OR, odds ratio; 95% CI, 95% confidence interval.
Intercept	−28.396	2.176	170.313			<0.001
Age	0.536	0.041	170.637	1.709	1.582−1.859	<0.001
E2	−0.014	0.003	25.897	0.986	0.981−0.991	<0.001
FSH	0.031	0.005	47.83	1.032	1.023−1.041	<0.001