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Table 3 Odds Ratios (ORs) of lung cancer associated with ETS from inside homes (all co-residents combined)

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

    All subjects Self-respondents only
ETS from co-residents Controls Cases     Controls Cases    
   Categories N=436 N=44 OR* 95%CI N=410 N=32 OR* 95%CI
  Never 113 16 1 (ref.) 105 11 1 (ref.)
  Ever 323 28 0.63 0.32 1.25 305 21 0.66 0.30 1.46
  Person-years           
   1-21 coresident-yrs 95 12 0.93 0.40 2.12 90 9 0.95 0.37 2.44
   22+ coresident-yrs 228 16 0.50 0.23 1.08 215 12 0.53 0.22 1.28
  Duration           
   <=100 (hrs/d x yrs) 126 13 0.75 0.34 1.69 118 11 0.89 0.36 2.19
   >100 (hrs/d x yrs) 197 15 0.54 0.25 1.20 187 10 0.51 0.20 1.27
  Cumulative exposure           
   <=4 pack-yrs 150 14 0.67 0.31 1.48 140 11 0.76 0.31 1.86
   >4 pack-yrs 173 14 0.60 0.27 1.34 165 10 0.58 0.23 1.47
  Exposure only < 20 yrs age 57 8 1.09 0.42 2.83 54 7 1.24 0.44 3.51
  Exposure only >= 20 yrs age 56 6 0.72 0.26 2.06 53 3 0.52 0.14 2.02
  Exposure both < & >= age 20 210 14 0.48 0.22 1.05 198 11 0.52 0.21 1.29
  1. *Adjusted for sex, age, median income, and proxy (if applicable).