Table 2. Results of univariate Cox analysis.

Variables	HR	Lower 95% CI	Upper 95% CI	P value
Race	0.727	0.612	0.863	<0.001***
Sex	0.889	0.781	1.013	0.077
Year of diagnosis	0.990	0.975	1.006	0.230
Tumor site	1.247	1.182	1.315	<0.001***
Laterality	0.940	0.739	1.196	0.616
Tumor histology	1.255	1.195	1.318	<0.001***
Surgery	0.777	0.680	0.889	<0.001***
RT	0.701	0.615	0.798	<0.001***
CT	1.258	1.092	1.450	0.002**
Coexistence of other malignancy	1.515	1.328	1.728	<0.001***
Age	2.146	2.020	2.280	<0.001***
Marital status	0.741	0.661	0.830	<0.001***
Rural/urban status	1.195	0.979	1.459	0.079
Household income	0.887	0.779	1.011	0.072
Tumor stage	1.563	1.335	1.829	<0.001***

**, P<0.010; ***, P<0.001. HR, hazard ratio; CI, confidence interval; RT, radiotherapy; CT, chemotherapy.