Table 2. Univariate and multivariate Cox regression analyses of HPV status with DSS and OS in the cohort study and after propensity score matching.

xxx	Cohort (n=1,539)					Propensity score matching (n=258)
	Univariate analysis		Multivariate analysis			Univariate analysis		Multivariate analysis
	P value		*aHR (95% CI)	P value		P value		aHR (95% CI)	P value
Non-oropharyngeal
DSS	0.094		0.77 (0.60–1.00)	0.051		0.126		0.71 (0.50–1.02)	0.065
OS	0.140		0.81 (0.64–1.03)	0.090		0.086		0.74 (0.53–1.02)	0.070
Larynx
DSS	0.041		0.60 (0.39–0.93)	0.022		0.030		0.52 (0.28–0.95)	0.034
OS	0.036		0.70 (0.47–1.03)	0.070		0.029		0.59 (0.34–1.00)	0.049
Hypopharynx
DSS	0.727		0.72 (0.40–1.27)	0.262		0.661		1.02 (0.34–3.06)	0.979
OS	0.966		0.81 (0.47–1.39)	0.444		0.456		1.10 (0.39–3.07)	0.864
Oral cavity
DSS	0.881		1.02 (0.68–1.55)	0.909		0.828		0.99 (0.52–1.89)	0.978
OS	0.686		1.05 (0.71–1.56)	0.795		0.743		0.95 (0.52–1.71)	0.856

*, aHR estimated from Cox models stratified by protocol. aHR, adjusted hazard ratio; DSS, disease-specific survival; OS, overall survival.