Table 3.

Relationship Between Exposure to Environmental Tobacco Smoke and SCCHN Within the Carolina Head and Neck Cancer Study (CHANCE) 2002–2006, Stratified by Race and Self Use of Tobacco

	3a. Never Used Tobacco Products
	Overall							African-Americans							Whites
	Cases		Controls		Crude	Adjusted		Cases		Controls		Crude	Adjusted		Cases		Controls		Crude	Adjusted
	n	%	n	%	OR	OR	95% CI	n	%	n	%	OR	OR	95% CI	n	%	n	%	OR	OR	95% CI
Exposed to Cigarettes at Home
Yes	53	42.4	188	42.9	1	1		2	25	37	43	1	1		51	43.6	151	42.9	1	1
No	72	57.6	250	57.1	1.12	0.82	0.53, 1.27	6	75	49	57	1.1	0.81	0.45, 1.45	66	56.4	201	57	1.12	0.82	0.52, 1.28
Amount of Cigarettes Exposed to Daily
None	72	57.6	250	58.3	1	1		6	75	49	58.3	1	1		66	56.4	201	58.3	1	1
1–19	33	26.4	113	26.3	1.17	0.86	0.51, 1.43	1	12.5	29	34.5	0.95	0.74	0.38, 1.43	32	27.4	84	24.4	1.25	0.9	0.53, 1.52
20 or more	20	16	66	15.4	1.25	0.86	0.47, 1.57	1	12.5	6	7.14	1.66	1.12	0.51, 2.48	19	16.2	60	17.4	1.21	0.84	0.46, 1.54
	3b. Ever Used Tobacco Products
Exposed to Cigarettes at Home
Yes	800	69	539	58.5	1	1		209	65.5	98	56	1	1		591	70	441	59	1	1
No	359	31	383	41.5	1.62	1.31	1.06, 1.61	110	34.5	77	44	1.6	1.29	0.86, 1.96	249	29.6	306	41	1.63	1.31	1.04, 1.66
Amount of Cigarettes Exposed to Daily
None	359	32	383	41.8	1	1		110	36.2	77	44.8	1	1		249	30.4	306	41.1	1	1
1–19	269	24	278	30.4	1.06	1.01	0.78, 1.29	76	25	60	34.9	0.86	0.86	0.54, 1.39	193	23.6	218	29.3	1.14	1.06	0.80, 1.41
20 or more	494	44	255	27.8	2.06	1.58	1.24, 2.02	118	38.8	35	20.4	2.65	2	1.18, 3.40	396	46	220	29.6	1.96	1.5	1.15, 1.97

CI: confidence interval; df: degrees of freedom; OR: odds ratio

^aAll models exclude missing data. Crude models adjusted for matching factors and their interactions. Adjusted models include matching factors, their interactions, and education, fruit and vegetable consumption and total alcohol consumption

^bLikelihood ratio test for effect measure modification by race: Any exposure in the home: χ²=0.003, df=1, P=0.96; Amount of cigarettes exposed to daily: χ²=2.64, df=3, P=0.45