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Table 1 Distribution of main characteristics of subjects included in two case–control studies conducted in Montreal, QC, Canada

From: Lung cancer risk among workers in the construction industry: results from two case–control studies in Montreal

  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)
  1. aSD Standard Deviation
  2. bMedian family income for census tract
  3. cCurrent smokers and subjects who quit <2 years before recruitment