Table 2.

Characteristics of OPSCC patients according to p16 status by HPV infection and daily lifestyle habits

	All cases (n = 100)	p16 positive (n = 34)	p16 negative (n = 66)	p value
High-risk-type HPV DNA status				< 0.001
Positive	46	34 (100)	14 (21.2)
Negative	54	0 (0)	52 (78.8)
HPV types
HPV 16	38	25	13
HPV 33	4	3	1
HPV 35	2	2
HPV 56	1	1
HPV 58	2	2
HPV 67	1	1
Low-risk-type HPV 6	1		1
Smoking consumption				0.001
Less than 40 pack-years	53	26 (76.5)	27 (40.1)
Equal to or more than 40 pack-years	47	8 (23.5)	39 (59.9)
Alcohol consumption (g/day)				0.003
0–39.9	43	22 (64.7)	21 (31.8)
≥ 40	57	12 (35.5)	45 (68.2)

HPV human papilloma virus