Univariate and multivariate Cox proportional hazards model for 5-year cancer-specific survival (N = 634 [147 events, 487 censored]).

Univariate and multivariate Cox proportional hazards model for 5-year cancer-specific survival (N = 634 [147 events, 487 censored]).</p

Univariate and multivariate Cox proportional hazards model for 5-year overall survival.

<p>(N = 634 [216 events, 418 censored]).</p

Univariate and multivariate Cox proportional hazards model for 5-year disease-free survival (N = 634 [207 events, 427 censored]).

<p>Univariate and multivariate Cox proportional hazards model for 5-year disease-free survival (N = 634 [207 events, 427 censored]).</p

Pretreatment patient characteristics of newly diagnosed head and neck cancer patients.

<p>(N = 622).</p

Comparison between those included and those excluded in the analysis.

<p>Comparison between those included and those excluded in the analysis.</p

Kaplan-Meier survival curves for the independent variables.

<p>Kaplan-Meier survival curves for the independent variables.</p