Table 3.
Overview of variables measured in this study
| Variable | Time Measured | ||||
| Baseline T0 | 3 months | 6 months | 9 months | 12 months | |
| T1 | T2 | T3 | T4 | ||
| Inclusion/exclusion | x | ||||
| Informed consent | x | ||||
| Randomization | x | ||||
| Prognostic variable | |||||
| Demographic variables (age, gender, ect) | x | ||||
| Potentional work-related physical factors (DMQ) | x | ||||
| Potential work-related psychosocial factors (JCQ) | x | ||||
| Outcome measures | |||||
| Primary | |||||
| Return to work | x | x | x | x | |
| Secondary | |||||
| 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 | |