Table 4.

Multivariate Cox regression analysis of female breast cancer patients.

Group	Regression coefficient	P	HR	95% CI
Age	0.414	<0.001	1.513	(1.279, 1.789)
Race	−0.174	0.014	0.841	(0.731, 0.966)
Tumor size	0.367	<0.001	1.443	(1.329, 1.567)
Lymph node metastasis	0.427	<0.001	1.533	(1.296, 1.812)
Distant metastasis	1.656	<0.001	5.240	(4.201, 6.535)
ER/PR	0.252	<0.001	1.287	(1.212, 1.367)
Histological grade	0.207	0.001	1.229	(1.090, 1.387)

HR, hazard ratio; CI, confidence interval, ER, estrogen receptor; PR, progesterone receptor.