Variable | Time Measured | ||||
---|---|---|---|---|---|
 | Baseline T0 | 3 months | 6 months | 9 months | 12 months |
 |  | T1 | T2 | T3 | T4 |
Inclusion/exclusion | x | Â | Â | Â | Â |
Informed consent | x | Â | Â | Â | Â |
Randomization | x | Â | Â | Â | Â |
Prognostic variable | Â | Â | Â | Â | Â |
   Demographic variables (age, gender, ect) | x |  |  |  |  |
   Potentional work-related physical factors (DMQ) | x |  |  |  |  |
   Potential work-related psychosocial factors (JCQ) | x |  |  |  |  |
Outcome measures | Â | Â | Â | Â | Â |
Primary | Â | Â | Â | Â | Â |
   Return to work | x | x | x |  | x |
Secondary | Â | Â | Â | Â | Â |
   Pain intensity (VAS) | x | x | x |  | x |
   Functional status (RDQ-24) | x | x | x |  | x |
   Pain coping (PCI) | x | x | x |  | x |
   Quality of life (Euroqol) | x | x | x |  | x |
   Patient Satisfaction with Occupational Health Services (PSOHSQ) |  | x |  |  |  |
   Cost diaries |  | x | x | x | x |