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Table 3 Overview of variables measured in this study

From: Multidisciplinary outpatient care program for patients with chronic low back pain: design of a randomized controlled trial and cost-effectiveness study [ISRCTN28478651]

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