Human Papillomavirus and Oropharyngeal Squamous Cell Carcinoma: A Case-Control Study regarding Tobacco and Alcohol Consumption

Table 1

Basic characteristics of all cases.

	Nonsmoking and nondrinking	Smoking and drinking
	𝑛	𝐧
Gender
Male	3	3
Female	13	13
Age at tumor incidence (years)
Mean	64.8	63.0
Range	45–83	50–78
Tumor stage
II	3	3
III	6	4*
IVA	7	9*
Year of initial diagnosis
1982–1986	2	1
1987–1991	2	3
1992–1996	6	5
1997–2001	2	5
2002–2006	4	2
Tumor location (ICD-code)
Base of tongue (141.0)	6	6
Tonsil (146.0)	5	5
Tonsillar fossa (146.1)	3	3
Vallecula (146.3)	2	2

*Best possible match for 2 cases was stage IVA instead of III.