Table 1.

Distribution of study subjects according to selected characteristics

VariableStudy I (1979-1986)Study II (1996-2001)
Population controlsCancer controlsCasesPopulation controlsCases
n = 533n = 1,349n = 857n = 899n = 738
Age (%)
    ≤55 y28.032.527.411.913.7
    56-65 y45.243.750.828.532.8
    66-75 y26.823.721.859.653.5
Ancestry (%)
    French64.258.069.164.477.5
    Anglo14.116.113.56.34.6
    Other21.825.917.429.317.9
Schooling (%)
    ≤7 y30.631.944.735.445.2
    8-13 y48.448.144.941.341.5
    >13 y21.019.910.423.313.3
Median family income (in Canadian dollars)*26,62724,76122,38635,29232,932
Smoking status (%)
    Never19.717.31.517.72.4
    Ever80.382.798.582.397.6
Pack-years49.952.374.340.774.5
Proxy respondent (%)12.619.229.49.940.0
  • *Mean of census tract median family income.

  • Mean pack-years among ever smokers, based on 20 cigarettes/pack.