Table 2. Cox regression analysis for disease free survival.

Variables	Univariate analysis				Multivariate analysis
	Hazard ratio	95% CI	P value		Hazard ratio	95% CI	P value
Age	1.015	0.990–1.040	0.240		1.016	0.990–1.043	0.226
Tumor size	2.698	1.646–4.422	<0.001		1.998	1.161–3.436	0.012
Lymph node metastasis	2.174	1.600–2.954	<0.001		1.991	1.437–2.757	<0.001
ER expression	0.740	0.444–1.233	0.246		0.737	0.360–1.507	0.403
PR expression	0.712	0.429–1.184	0.188		0.904	0.453–1.806	0.776
HER2 expression	0.848	0.507–1.417	0.529		0.693	0.405–1.187	0.182
BMI	0.994	0.918–1.076	0.881		0.981	0.902–1.068	0.659

BMI, body mass index; ER, estrogen receptor; PR, progesterone receptor; HER2, human epidermal growth factor receptor-2.