Characteristics of 345 heavy construction workers by job group at the start of the survey (1991)
| Variable |
Tunnel workers (n=96) |
Outdoor workers (n=178) |
White collar employees (n=71) |
| Age (y, mean (SD)) | 39 (9) | 39 (10) | 41 (8) |
| Height (cm, mean (SD)) | 180 (6) | 179 (6) | 180 (6) |
| Duration of employment (y, mean (SD)) | 19 (8) | 16 (8) | 18 (9) |
| Smoking (n (%)): | |||
| Never smokers | 26 (27) | 51 (29) | 29 (41) |
| Former smokers | 20 (21) | 34 (19) | 20 (28) |
| Current smokers | 50 (52) | 93 (52) | 22 (31) |
| Pack-years (mean (SD)) | 10 (12) | 14 (8) | 16 (12) |
| Phadiatop positive (n (%)) | 12 (13) | 27 (15) | 15 (21) |