Table 3. Kaplan-Meier and Cox-Regression Analysis of the 188 Primary OPSCC Cases.

Variable	Kaplan-Meier	Cox-Regression
	p value	p value	Hazard Ratio	95% Confidential Interval
Sex	0.003	0.152	0.340	0.078 to 1.489
Age	0.833
Histological grades	0.009	0.017	1.916	1.124 to 3.966
T stage	0.183
Chemotherapy	0.046	0.112	1.539	0.905 to 2.619
Radiation therapy	0.996
Metastasis	0.072
Clinical stage	0.003
Nodal stage	0.004	0.019	1.807	1.101 to 2.964
Smoke	0.048	0.661	1.126	0.663 to 1.911
Alcohol consumption	0.499
Site	0.378
p16INK4A expression	0.417
HPV16	0.009	0.011	0.159	0.038 to 0.622
p53 expression	0.073