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Table 2 Odds Ratios (ORs) of lung cancer associated with ETS from parents or spouses

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

    All subjects Self-respondents only
ETS source Controls Cases     Controls Cases    
   Categories N=436 N=44 OR* 95%CI N=410 N=32 OR* 95%CI
Parents           
  Never 195 26 1 (ref.) 179 17 1 (ref.)
  Ever 241 18 0.62 0.32 1.21 231 15 0.69 0.33 1.43
  Person-years           
   1-21 parent-yrs 135 10 0.62 0.28 1.36 129 8 0.65 0.27 1.57
   22+ parent-yrs 106 8 0.64 0.27 1.50 102 7 0.73 0.29 1.84
  Duration           
   <=75 (hrs/d x yrs) 119 9 0.64 0.28 1.46 114 8 0.74 0.31 1.79
   >75 (hrs/d x yrs) 122 9 0.61 0.27 1.38 117 7 0.63 0.25 1.59
  Cumulative exposure           
   <=3 pack-years 146 9 0.50 0.22 1.13 137 8 0.63 0.26 1.50
   >3 pack-years 95 9 0.86 0.37 1.99 94 7 0.79 0.31 2.02
Spouses           
  Never 262 34 1 (ref.) 242 25 1 (ref.)
  Ever 174 10 0.39 0.18 0.85 168 7 0.37 0.15 0.93
  1. *Adjusted for sex, age, median income, and proxy (if applicable).