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. Author manuscript; available in PMC: 2015 May 1.
Published in final edited form as: Oral Oncol. 2014 Feb 22;50(5):513–519. doi: 10.1016/j.oraloncology.2014.02.001

Table 3.

Stepwise Multivariate Cox Regression for Locoregional Failure after Chemoradiation in the All Patients and the HPV+ Cohorts

ALL PATIENTS (N=198)
Characteristic* HR P-value
Pack-Years 1.01 (1.00 to 1.02) 0.038
N-stage (N3 vs. N0-2c) 3.18 (1.44 to 6.98) 0.004
HPV Status (Positive vs. negative) 0.42 (0.18 to 0.98) 0.046
HPV-POSITIVE COHORT (N=184)
Characteristic* HR P-value
T-stage (T4 vs. T1-3) 2.17 (1.01 to 4.67) 0.048
N-stage (N3 vs. N0-2c) 3.99 (1.75 to 9.11) 0.001
*

Other characteristics which were statistically significant in the univariate models (Table 2) did not improve the multivariate model fit and were therefore omitted