Table 8.

Patient and tumor characteristics significantly predicting overall survival amongst oral cavity cancer patients by multivariable Cox proportional hazard model (n = 282).

Variable/Factor	Statistic	Increased Risk of Death
Age (Continuous)	HR = 0.039 SE = 0.007 p < 0.0001	Older age
Sex	HR = −0.514 SE = 0.153 p = 0.001	Male > Female
Smoking Status	Base comparison to: Current smoker (vs. ex, never, Missing) HR = −0.634, −0.371, −0.246 SE = 0.196, 0.196, 0.219 p = 0.007, 0.001, 0.058, 0.260	Current smoker, Missing > Ex-smoker
Treatment	Base comparison to: all three modalities HR = 0.577, 0.222, −0.638, −0.126 SE = 0.272, 0.292, 0.256, 0.246 p < 0.0001, 0.034, 0.447, 0.013, 0.608	Radiotherapy > Surgery/Radiotherapy/Chemotherapy, Surgery