Table 1 Percentage or mean ± SD of participant characteristics of work ability and percentage of hours worked (n = 794)
| Â | % | Mean | SD | N |
|---|---|---|---|---|
Age at time of participation | Â | 40.0 | 8.5 | 794 |
Gender male | 37% | Â | Â | 794 |
Education level | Â | Â | Â | 794 |
 Primary school | 1% |  |  |  |
 Lower vocational education | 1% |  |  |  |
 Secondary vocational education | 26% |  |  |  |
 Higher vocational education | 34% |  |  |  |
 University | 32% |  |  |  |
 Other | 6% |  |  |  |
% participants with pain | 80% | Â | Â | 794 |
% participants with stiffness | 49% | Â | Â | 794 |
% participants with tingling feelings or numbness | 42% | Â | Â | 794 |
Main cause of the start of complaints | Â | Â | Â | 742 |
 A single cause cannot be identified | 17% |  |  |  |
 Overload during leisure | 2% |  |  |  |
 Short-term overload during work | 5% |  |  |  |
 Long-term overload during work | 70% |  |  |  |
 Accident, strain | 1% |  |  |  |
 Other(e.g. stress, posture, furniture) | 53% |  |  |  |
Complaint duration in years | Â | 5.6 | 3.1 | 755 |
Work ability score (WAS) (0–10) |  | 6.4 | 2.0 | 794 |
% worked of Fulltime employment (0–100) |  | 77.0 | 35.0 | 794 |
DASH score (0–100) |  | 28.3 | 19.0 | 668 |
DASH work module (0–100) |  | 41.0 | 25.8 | 784 |
SF-36 subscale physical functioning (0–100) |  | 80.0 | 15.3 | 780 |
SF-36 subscale pain (0–100) |  | 59.3 | 20.1 | 793 |
SF-36 subscale physical role functioning (0–100) |  | 41.9 | 39.3 | 788 |