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Table 2 The association between ETS and risk of lung cancer among never smokers in a population based case-control study, Greater Toronto Area, Ontario, 1997-2002

From: Lung cancer risk in never-smokers: a population-based case-control study of epidemiologic risk factors

  Total Population n = 1393   Never smokers n = 622  
  Case, n Control, n ORa 95%CI Case, n Control, n ORb 95%CI
  445 948    156 466   
ETS Exposure         
   None 29 88 Refc   23 68 Refd  
   At home Adult and/or Child 375 772 1.2 0.7-1.9 109 341 1.1 0.6-1.9
Childhood 333 672 1.1 0.7-1.9 93 298 1.0 0.6-1.8
Adulthood 226 439 1.0 0.6-1.7 50 247 1.0 0.5-2.0
   At work 259 463 1.3 0.9-1.9 69 179 1.2 0.7-2.1
< 10 years 73 194 1.1 0.8-1.6 32 90 1.3 0.8-2.2
> 10 years 176 261 1.2 0.9-1.6 37 86 1.2 0.7-2.0
   At both home and work 226 405 1.4 0.9-2.2 50 142 1.2 0.7-2.1
  1. aOR is adjusted for pack-years of smoking, age, sex, education and ethnicity
  2. bOR is adjusted for age, sex, education and ethnicity
  3. cReference group consists of all participants with no ETS exposure
  4. dReference group consists of never-smokers with no ETS exposure