TABLE 3.

Univariable and multivariable Cox regression analysis of patient clinical characteristics.

Variable	Univariate analysis			Multivariate analysis
	HR	95%CI	P-value	HR	95%CI	P-value
Age	1.010	0.991–1.030	0.296	–
Sex (female/male)	0.670	0.633–1.342	0.921	–
Race (Caucasian/non-Caucasian)	2.330	1.246–4.355	0.008	2.327	1.222–4.429	0.016
Smoke history (no/yes)	0.671	0.337–1.335	0.256	–
T stage (T1-T2/T3-T4)	1.449	1.134–1.851	0.003	1.241	1.032–1.492	0.021
N stage (N1-N2/N3-N4)	1.709	1.367–2.136	<0.001	2.800	1.796–4.366	<0.001
M stage (M0/M1)	1.654	0.804–3.403	0.172	–
Chemotherapy (No/Yes)	0.780	0.065–0.098	0.041	0.634	0.410–0.980	0.040
Radiotherapy (No/Yes)	2.025	1.310–3.130	0.001	1.369	0.828–2.265	0.221
Risk score (Low/High)	2.707	1.782–4.112	<0.001	2.533	1.645–3.901	<0.001