TABLE 5.

Mortality risks by human papillomavirus status

HPV	Number of dead (%)	Unadjusted HR a (95% CI); p	Adjusted b HR (95% CI); p	IPTW c HR (95% CI); p
Negative	149 (29.56%)	Ref	Ref	Ref
Positive	83 (25.86%)	0.85 (0.65–1.11); p = 0.22	0.89 (0.67–1.19); p = 0.43	0.89 (0.77–1.03); p = 0.13

^a Derived from Cox regression.

^b Adjusted for Age, Race, Income, Education, Tumor Size, Grade, Margin, Tumor stage, Primary site surgery, and Lymph node removal surgery.

^c IPTW derived logistic regression for HPV status with Age, Race, Income, Education, Tumor Size, Grade, Margin, Tumor stage, Primary Site Surgery, and Lymph node removal surgery as the covariates.

Abbreviations: CI, confidence interval; HPV, human papillomavirus; HR, Hazard ratio; IPTW, inverse probability of treatment weighting.