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Table 4 The association between previous medical history and risk of lung cancer 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   
Emphysema         
   Never 414 940 1.0 Ref 154 465 1.0 Ref
   Ever 31 8 4.8 2.0-11.1 2 1 3.1 0.3-35.9
Chronic Bronchitis         
   Never 424 899 1.0 Ref 153 440 1.0 Ref
   Ever 21 49 0.9 0.5-1.7 3 26 0.4 0.1-1.5
Asthma         
   Never 388 835 1.0 Ref 140 408 1.0 Ref
   Ever 57 113 1.2 0.8-1.8 16 58 1.0 0.5-1.9
Pneumonia         
   Never 434 913 1.0 Ref 151 456 1.0 Ref
   Ever 11 35 0.6 0.3-1.2 5 10 1.9 0.6-6.2
Tuberculosis         
   Never 439 943 1.0 Ref 153 463 1.0 Ref
   Ever 6 5 2.6 0.7-9.2 3 3 2.2 0.4-12.5
Other respiratory illness       
   Never 385 823 1.0 Ref 139 403 1.0 Ref
   Ever 60 125 1.1 0.8-1.6 17 63 0.9 0.5-1.7
  1. aOR is adjusted for pack-years of smoking, age, sex, education and ethnicity
  2. bOR is adjusted for age, sex, education and ethnicity