Lung cancer risk and pollution in an industrial region of Northern Spain: a hospital-based case-control study

Table 3 Odds ratios of lung cancer, overall and by histologic subtype, in Asturias, by exposure category

	Total				Squamous cell carcinoma			Adenocarcinoma			Small cell carcinoma
	Controls	Cases	OR (95%CI)^a	P-value^b	Cases	OR (95%CI)^a	P-value^b	Cases	OR (95%CI)^a	P-value^b	Cases	OR (95%CI)^a	P-value^b
	N	N			N			N			N
Unexposed	437	416	Reference		171	Reference		114	Reference		74	Reference
Industrial	63	74	1.49 (0.93-2.39)		20	0.98 (0.49-1.94)		20	1.82 (0.90-3.66)		18	2.23 (1.01-4.92)
Urban	63	70	1.33 (0.86-2.06)		24	1.19 (0.65-2.21)		28	1.92 (1.09-3.38)		8	0.87 (0.36-2.10)
Semi-urban	63	66	1.34 (0.86-2.07)	0.190	27	1.65 (0.92-2.97)	0.400	20	1.46 (0.78-2.72)	0.070	9	1.13 (0.50-2.58)	0.230

^aORs were estimated from a multiple logistic regression model that included age, sex, hospital area, tobacco consumption, family history of cancer, and occupation
^bP-value for the whole effect of outdoor exposure

ISSN: 1476-072X