| Gender | | | |
| Men | 108 (26) | 21 (11) | 9734 (28) |
| Women | 310 (74) | 174 (89) | 24491 (72) |
| Mean (SD) age (years) | 48.2 (6.5) | 48.7 (5.5) | 43.8 (8.0) |
| Occupational status | | | |
| Higher grade non-manual | 67 (16) | 37 (19) | 10810 (32) |
| Lower grade non-manual | 184 (44) | 97 (50) | 14684 (43) |
| Manual | 167 (40) | 61 (31) | 8731 (25) |
| Short (⩽3 days) sickness absence spells before rehabilitation (rate/person-year) | 1.53 | 1.57 | 1.14 |
| All long (>3 days) sickness absence spells before rehabilitation (rate/person-year) | 1.45 | 1.02 | 0.62 |
| Very long sickness absence spells (>21 days) before rehabilitation (rate/100 person-years) | 26.8 | 15.4 | 9.5 |
| Consumption of prescribed analgesics before rehabilitation (DDD/person-year) | 17.6 | 17.6 | 7.1 |