Table 2.

Univariate survival analysis of OSCC with surgery ^a

Variable	HR	95% CI	P
Gender
Male (n = 238)	1.147	(0.846, 1.557)	0.377
Female (n = 216)	1
Age
> 50 (n = 391)	0.780	(0.516, 1.178)	0.238
≤ 50 (n = 63)	1
Place
Suburban (n = 113)	1.262	(0.898, 1.774)	0.180
Urban (n = 341)	1
Tumor site
Oropharynx (n = 39)	1.103	(0.648, 1.875)	0.718
Oral cavity, lip (n = 415)	1
pTNM stage
III–IV (n = 232)	2.458	(1.774, 3.406)	< 0.001
I–II (n = 222)	1
T stage
T3–4 (n = 152)	1.896	(1.393, 2.581)	< 0.001
T1–2 (n = 302)	1
Nodal metastasis
N+ (n = 149)	2.426	(1.786, 3.295)	< 0.001
N0 (n = 305)	1
Tumor differentiation
II–III (n = 197)	1.840	(1.319, 2.565)	< 0.001
I (n = 210)	1
Cigarettes
Yes (n = 160)	0.901	(0.652, 1.246)	0.528
No (n = 294)	1
Alcohol
Yes (n = 115)	0.892	(0.625, 1.274)	0.529
No (n = 339)	1
Neck dissection
Yes (n = 334)	1.309	(0.911, 1.882)	0.146
No (n = 119)	1
Postoperative radiotherapy
Yes (n = 136)	1.858	(1.360, 2.538)	< 0.001
No (n = 318)	1

^aUnivariate Cox proportional hazards logistic regression