Table 7.

Univariate and multivariate Cox proportional hazard model analysis of overall mortality

Variable	Category	Univariate Cox proportional hazards (95 % CI)	p-value*	Multivariate Cox proportional hazards (95 % CI)	p-value*
Overall mortality
Primary site	Non-oropharyngeal vs Oropharyngeal	1.128 (0.698–1.823)	0.6229	1.822 (1.025–3.238)	0.0408
COPD	Yes vs. No			2.022 (1.205–3.394)	0.0077
Prior Cancer	Yes vs. No			1.622 (0.980–2.683)	0.0599
Primary Treatment	Surgery vs. Chemotherapy/Radiation			0.367 (0.212–0.636)	0.0004
Stage	Stage 4 vs Other			2.117 (1.306–3.432)	0.0023
Age	Age ≥ 55 vs <55			1.721 (0.928–3.193)	0.0850

^*α = 0.05, significant results in bold using Cox proportional hazard model