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Table 5 Odds Ratios (ORs) of lung cancer associated with ETS from all sources combined

From: Exposure to environmental tobacco smoke (ETS) and risk of lung cancer in Montreal: a case–control study

   All subjects Self-respondents only
   Controls Cases     Controls Cases    
Index N=436 N=44 OR* 95%CI N=410 N=32 OR* 95%CI
Duration (in hrs/d x yrs)           
  <=100 173 18 1 (ref.) 163 11 1 (ref.)
  101-190 103 13 1.19 0.55 2.60 94 11 1.74 0.73 4.19
  >190 160 13 0.86 0.40 1.85 153 10 0.97 0.40 2.36
Cumulative exposure (in pack-years)         
  <=2.5 176 18 1 (ref.) 163 11 1 (ref.)
  2.5-6 101 12 1.37 0.61 3.06 96 11 1.68 0.70 4.04
  >6 159 14 0.96 0.45 2.04 151 10 0.98 0.40 2.38
  1. *Adjusted for sex, age, median income, and proxy (if applicable).