| Workplace category | Subjects characteristics (male n = 73; female n = 76) | |
| N (m:f) | Age (median [range]) | |
| Professional/technical | 56 (23:33) | 38 [22 - 59] |
| Office work | 14 (8:6) | 31.5 [20 - 59] |
| Sales | 16 (16:0) | 43 [22 - 52] |
| Service | 34 (7:27) | 32 [19 - 61] |
| Safety | 18 (18:0) | 39.5 [24 - 58] |
| Construction | 1 (1:0) | 65 [65] |
| Student | 10 (0:10) | 20 [19 - 21] |
| Total | 149 (73:76) | 36 [19 - 65] |