Occupational exposure to asbestos and lung cancer in men: evidence from a population-based case-control study in eight Canadian provinces

Table 2 Adjusted odds ratios of lung cancer in relation to occupational exposure to asbestos

Occupational exposure	Cases	Controls	Odds ratio^A and 95% CI		Odds ratio^B and 95% CI
Unexposed*	1448	1829	1.0	-	1.0	-
Ever exposed	233	224	1.31	1.07 – 1.59	1.28	1.02 – 1.61
Highest attained exposure
Unexposed	1448	1829	1.0	-	1.0
Low	194	200	1.22	0.99 – 1.51	1.17	0.92 – 1.50
Medium / High	39	24	2.02	1.20 – 3.97	2.16	1.21 – 3.88
Total	1681	2053
Duration of exposure (years)
< 10	88	68	1.68	1.21 – 2.33	1.60	1.10 – 2.33
10 - < 20	46	50	1.08	0.74 – 1.69	0.89	0.56 – 1.42
≥ 20	87	103	1.05	0.78 – 1.42	1.18	0.84 – 1.66

A – Adjusted for age, province,
B – Adjusted for age, province, cigarette pack years, occupational exposure to diesel and silica, exposure to second hand smoke.

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