Selected characteristics of male study subjects from two case–control studies of lung cancer, Montreal
| Study I: 1979–1986 | Study II: 1996–2001 | |||||
| Characteristics | Cases | Population controls | Cancer controls | Cases | Population controls | |
| Total number | 857 (%) | 533 (%) | 1349 (%) | 765 (%) | 899 (%) | |
| Age | ||||||
| 35–54 years | 27.5 | 27.8 | 32.5 | 11.1 | 14.6 | |
| 55–64 years | 45.5 | 39.7 | 39.0 | 34.4 | 30.1 | |
| 65+ years* | 27.0 | 32.5 | 28.5 | 54.5 | 55.3 | |
| Ethnicity | ||||||
| French | 69.2 | 64.2 | 57.9 | 75.0 | 64.4 | |
| Other | 30.8 | 35.8 | 42.1 | 25.0 | 35.6 | |
| Income | ||||||
| Low | 58.5 | 33.0 | 48.6 | 44.4 | 36.9 | |
| Medium | 23.1 | 33.2 | 20.2 | 31.4 | 34.3 | |
| High | 18.4 | 33.8 | 31.2 | 24.2 | 28.8 | |
| Schooling | ||||||
| <7 years | 30.4 | 20.5 | 22.3 | 42.1 | 34.5 | |
| 8–12 years | 48.1 | 48.0 | 46.1 | 36.1 | 36.7 | |
| 12+ years | 21.5 | 31.5 | 31.4 | 16.1 | 27.2 | |
| Missing | 0.0 | 0.0 | 0.2 | 5.7 | 1.6 | |
| Respondent | ||||||
| Self | 70.7 | 87.3 | 80.7 | 60.1 | 90.1 | |
| Surrogate | 29.3 | 12.7 | 19.3 | 39.9 | 9.9 | |
| Smoking | ||||||
| Never | 1.1 | 15.9 | 13.4 | 2.8 | 17.4 | |
| <30 years | 9.7 | 20.7 | 22.7 | 9.2 | 29.1 | |
| 30–40 years | 26.0 | 23.6 | 19.6 | 22.4 | 22.1 | |
| 40+ years | 63.2 | 39.8 | 44.3 | 65.6 | 31.4 | |
↵* In study I, this category includes ages 65–70; in study II this category includes ages 65–75.