Characteristics of the employees
| White collar | Blue collar | Somatic after hernia | Somatic pregnant | Mental | |
| Age (mean (SD)) | 35 (6.4) | 35.8 (8.9) | 43 (7.4) | 31 (2.7) | 44 (9.1) |
| Sex (% female) | 51% | 3% | 37% | 100% | 46% |
| Supervisor (% yes) | 24% | 16% | 32% | 23% | 14% |
| Education level1-150 (median) | 7 | 2 | 3.5 | 6 | 6 |
| Sick leave (%) | 0% | 0% | 100% | 13% | 68% |
| Hours work | 40 | 41 | 39 | 32 | 35 |
↵1-150 Scored on a 7 point scale: lowest education is primary school (1), highest education is university (7).