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Table 1 Distribution of subjects according to selected socio-demographic characteristics

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

   All Subjects self-respondents only
  Categories Controls Cases Controls Cases
   N=436 % N=44 % N=410 % N=32 %
Sex          
  Male 128 29% 13 30% 117 29% 10 31%
  Female 308 71% 31 70% 293 71% 22 69%
Age          
  <= 55 92 21% 12 27% 89 22% 7 22%
  56-65 136 31% 9 20% 133 32% 9 28%
  66-75 208 48% 23 52% 188 46% 16 50%
Ethnicity         
  French Canadian 246 56% 25 57% 239 58% 17 53%
  Other 190 44% 19 43% 171 42% 15 47%
Schooling         
  < 7 years 137 31% 16 36% 123 30% 10 31%
  7-12 years 172 39% 18 41% 163 40% 14 44%
  13+ years 127 29% 10 23% 124 30% 8 25%
Family income*         
  < 30.000 140 32% 17 39% 133 32% 10 31%
  30.000 - 45.000 172 39% 15 34% 161 39% 12 38%
  > 45.000 124 28% 12 27% 116 28% 10 31%
Respondent         
  Self 410 94% 32 73% 410 100% 32 100%
  Proxy 26 6% 12 27%     
  1. *Median family income for census tract in Can$.