Table 3 -.

Distant metastasis-free survival - MV - HPV-pos

		Distant metastasis-free survival (years)
		-
Covariate	Level	Hazard Ratio	HR P-value
N stage	N3	2.18 (1.10–4.35)	0.026
	N0/N1/N2	-	-
Age	>=50	2.75 (1.09–6.93)	0.032
	<50	-	-
Smoking history (pack-years)	>0	3.73 (1.76–7.91)	<.001
	0	-	-

^*Number of observations in the original data set = 402. Number of observations used = 402.

^**Backward selection with an alpha level of removal of 0.1 was used. The following variables were removed from the model: Gender, and T stage.