Table 1.

Frequency distribution of demographic and risk factors in SCCHN cases and controls

Characteristics	Patients (n = 380)		Controlsa (n = 335)		P valueb
	No.	%	No.	%
Age (years)					0.526
<40	32	8.4	27	8.1
41–55	142	37.4	109	32.5
56–70	159	41.8	157	46.9
>70	47	12.4	42	12.5
Sex					0.100
Male	285	75.0	269	80.3
Female	95	25.0	66	19.7
Ethnicity
Non-Hispanic white	380	100.0	335	100.0
Tobacco smoking					0.588
Ever	278	73.2	239	71.3
Never	102	26.8	96	28.7
Alcohol drinking
Ever	296	77.9	240	71.6	0.054
Never	84	22.1	95	28.4
Tumor site
Oropharyngeal	187	49.2
Non-Oropharyngeal	193	50.8

^a The controls were frequency matched to the patients on the factors shown in this table.

^b Two-sided χ² test.