Table 1 Selected socio-demographic characteristics of male subjects in the two case–control studies, Montreal, Canada
Study I (1979–1986) | Study II (1996–2001) | |||||
|---|---|---|---|---|---|---|
Variables | Categories | Population controls | Cancer controls | Cancer cases | Population controls | Cancer cases |
N = 533 | N = 1349 | N = 857 | N = 894 | N = 736 | ||
Age group (%) | ≤55 years | 28.0 | 32.5 | 27.4 | 11.9 | 13.6 |
56-65 years | 45.2 | 43.7 | 50.8 | 28.6 | 32.9 | |
66-75 years | 26.8 | 23.7 | 21.8 | 59.5 | 53.5 | |
Ethnolinguistic group (%) | French | 64.2 | 58.0 | 69.1 | 64.4 | 77.4 |
English | 14.1 | 16.1 | 13.5 | 6.4 | 4.6 | |
Other | 21.8 | 25.9 | 17.4 | 29.2 | 17.9 | |
Schooling (%) | <7 years | 20.3 | 22.3 | 30.3 | 24.7 | 28.0 |
7-12 years | 56.1 | 55.2 | 57.1 | 48.1 | 56.2 | |
≥13 years | 23.6 | 22.5 | 12.6 | 27.2 | 15.8 | |
Median family income* | 100 | 93 | 84 | 100 | 94 | |
Smoking (%) | Never | 19.7 | 17.3 | 1.5 | 17.7 | 2.4 |
Current | 46.9 | 58.0 | 79.9 | 29.2 | 67.5 | |
Quit smoking (%) | 2-5 years ago | 8.8 | 6.7 | 7.6 | 2.8 | 4.3 |
5-10 years ago | 7.9 | 6.2 | 6.0 | 6.6 | 5.8 | |
>10 years ago | 16.7 | 11.8 | 5.0 | 43.7 | 19.8 | |
Mean pack-years** | 49,9 | 52.3 | 74.3 | 50.3 | 78.5 | |
Respondent (%) | Self | 87.4 | 80.8 | 70.6 | 90.3 | 60.2 |
Proxy | 12.6 | 19.2 | 29.4 | 9.7 | 39.8 | |