Table 1 Distribution of main characteristics of subjects included in two case–control studies conducted in Montreal, QC, Canada
Study I : 1979–1986 | Study II : 1996–2002 | |||
|---|---|---|---|---|
Cases (857) | Controls (533) | Cases (736) | Controls (894) | |
Age (years), mean (SDa) | 59.3 (7.0) | 59.6 (7.9) | 64.1 (7.9) | 65.0 (7.6) |
Ethnicity (%) | ||||
French | 592 (69.1) | 342 (64.2) | 570 (77.4) | 576 (64.4) |
British Isles | 116 (13.5) | 75 (14.1) | 34 (4.6) | 57 (6.4) |
Other | 149 (17.4) | 116 (21.8) | 132 (17.9) | 261 (29.2) |
Educational level (%) | ||||
Primary | 260 (30.3) | 108 (20.3) | 328 (44.6) | 316 (35.3) |
Secondary | 489 (57.1) | 299 (56.1) | 315 (42.8) | 372 (41.6) |
Postsecondary | 108 (12.6) | 126 (23.6) | 93 (12.6) | 206 (23.0) |
Respondent status (%) | ||||
Self | 605 (70.6) | 466 (87.4) | 443 (60.2) | 807 (90.3) |
Proxy | 252 (29.4) | 67 (12.6) | 293 (39.8) | 87 (9.7) |
Median family incomeb (in Can$), mean (SD) | 22386.2 (7640.3) | 26627.5 (8533.6) | 32961.1 (14948.6) | 35187.4 (14097.0) |
Smoking status (%) | ||||
Never | 13 (1.5) | 105 (19.7) | 18 (2.4) | 158 (17.7) |
Former | 159 (18.6) | 178 (33.4) | 205 (27.9) | 461 (51.6) |
Currentc | 685 (79.9) | 250 (46.9) | 513 (69.7) | 275 (30.7) |
Held a job in the construction industry (%) | ||||
Never | 650 (75.8) | 420 (78.8) | 529 (71.9) | 686 (76.7) |
Ever | 207 (24.2) | 113 (21.2) | 207 (28.1) | 208 (23.3) |
Only in the construction industry | 26 (3.0) | 9 (1.7) | 27 (3.7) | 21 (2.3) |
Both construction and other industries | 181 (21.1) | 104 (19.5) | 180 (24.5) | 187 (20.9) |
Years worked in construction industry- mean (SD) | 18.1 (12.8) | 16.9(12.2) | 17.9 (13.6) | 19.3(14.8) |