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Table 3 Odds ratio for lung cancer associated with occupational exposure wood dust in two case–control studies

From: Occupational exposure to wood dust and risk of lung cancer in two population-based case–control studies in Montreal, Canada

  Controls Cases OR1* OR2** 95% CI (OR2)
Study I Population Controls      
No exposure 389 630 1.0 1.0 (ref)
Any level of exposure 144 227 0.8 0.7 0.5 1.0
Any level ≤ 20 years 88 141 0.8 0.7 0.5 1.0
Any level > 20 years 56 86 0.7 0.7 0.4 1.1
Non-substantial level 74 113 0.8 0.7 0.5 1.0
Substantial level 70 114 0.7 0.7 0.5 1.0
Study I Cancer Controls     
No exposure 1072 630 1.0 1.0 (ref)
Any level of exposure 277 227 1.2 1.1 0.9 1.5
Any level ≤ 20 years 179 141 1.2 1.1 0.8 1.5
Any level > 20 years 98 86 1.2 1.2 0.8 1.7
Non-substantial level 161 113 1.0 1.0 0.7 1.3
Substantial level 116 114 1.5 1.4 1.0 2.0
Study II Population Controls     
No exposure 640 501 1.0 1.0 (ref)
Any level of exposure 254 235 1.2 1.1 0.9 1.5
Any level ≤ 20 years 165 139 1.1 1.0 0.8 1.4
Any level > 20 years 89 96 1.4 1.3 0.9 1.9
Non-substantial level 201 167 1.1 1.0 0.7 1.3
Substantial level 53 68 1.9 1.7 1.1 2.7
  1. *adjusted for age, ethnolinguistic group, years of education, median family income, respondent status and cigarette index.
  2. **adjusted for the same covariates as above, as well as IARC Group 1 occupational carcinogens (asbestos, diesel exhaust, formaldehyde, cadmium, chromium VI, nickel and silica).