Table 1.
Main characteristics of cases and controls
| Cases (n = 1857) | Controls (n = 2780) | |
|---|---|---|
| n (%) | n (%) | |
| Age (years) | ||
| < 40 | 24 (1.3) | 76 (2.7) |
| [40;49] | 286 (15.4) | 555 (20.0) |
| [50;59] | 786 (42.3) | 825 (29.7) |
| [60;69] | 548 (29.5) | 939 (33.8) |
| ≥ 70 | 213 (11.5) | 385 (13.9) |
| Missing | 0 (0.0) | 0 (0.0) |
| Mean ± sd | 58.01 ± 8.50 | 58.07 ± 9.92 |
| Level of education | ||
| Primary | 544 (29.3) | 521 (18.7) |
| Vocational secondary | 761 (41.0) | 1081 (38.9) |
| Secondary | 120 (6.5) | 310 (11.2) |
| University | 163 (8.8) | 752 (27.1) |
| Other | 26 (1.4) | 19 (0.7) |
| Missing | 243 (13.1) | 97 (3.5) |
| Socioeconomic status | ||
| Farmers | 49 (2.6) | 168 (6.0) |
| Self employed workers | 117 (6.3) | 152 (5.5) |
| Managers | 115 (6.2) | 544 (19.6) |
| Intermediate occupations | 191 (10.3) | 564 (20.3) |
| Employees | 190 (10.2) | 297 (10.7) |
| Blue Collar workers | 1175 (63.3) | 1053 (37.9) |
| Missing | 20 (1.1) | 2 (0.1) |
| Alcohol consumption (glasses per day) | ||
| [0.00; 0.03] | 73 (3.9) | 206 (7.4) |
| [0.03; 2.00] | 235 (12.7) | 1190 (42.8) |
| [2.00; 5.00] | 440 (23.7) | 849 (30.5) |
| [5.00; 8.00] | 384 (20.7) | 305 (11.0) |
| [8.00; 12.00] | 328 (17.7) | 134 (4.8) |
| > 12.00 | 331 (17.8) | 73 (2.6) |
| Missing | 66 (3.6) | 23 (0.8) |
| Smoking status | ||
| Never | 53 (2.9) | 753 (27.1) |
| Former | 481 (25.9) | 1271 (45.7) |
| Current | 1316 (70.9) | 751 (27.0) |
| Missing | 7 (0.4) | 5 (0.18) |
| Smoking frequency (grams/day) | ||
| Never smoker | 53 (2.9) | 753 (27.1) |
| [0.00; 10.00] | 205 (11.0) | 668 (24.1) |
| [10.00;20.00] | 565 (30.4) | 725 (26.1) |
| [20.00; 25.00] | 372 (20.0) | 261 (9.4) |
| > 25.00 | 578 (31.1) | 301 (10.8) |
| Missing | 84 (4.5) | 72 (2.6) |
| Smoking duration (years) | ||
| Never smoker | 53 (2.8) | 753 (27.1) |
| [0; 20] | 115 (6.2) | 760 (27.3) |
| [20; 30] | 337 (18.2) | 529 (19.0) |
| [30; 40] | 762 (41.0) | 439 (15.8) |
| > 40 | 575 (31.0) | 291 (10.5) |
| Missing | 15 (0.8) | 8 (0.3) |