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Table 1 Measured data and their instruments and timing of data collection

From: Design of a randomized controlled trial on the effects of Counseling of mental health problems by Occupational Physicians on return to work: the CO-OP-study

Data Instrument Base-line Follow up
Data related to primary outcomes   T0 T1 T2 T3 T4
Return to work       
Full Return to work Database company X    X  
Net return to work Database company X    X  
First (partial or full) return to work Database company X X X X  
Time until 1st recurrence Database company X     X
Number and days of recurrences of sick leave Database company     X X
Total days of sick leave during one year follow up Database company X    X X
Treatment satisfaction       
Treatment satisfaction of employee Questionnaire   X X X  
Treatment satisfaction of employer Questionnaire   X X X  
Treatment satisfaction of the OP Questionnaire     X  
Data related to secondary outcome       
Cost effectiveness       
Direct costs of treatment       
   • Consultations OP and treatment OHS Medical files OHS X X X X  
   • Consultations of participating psychologist centre Medical files centre X X X X  
   • Consultation of general practitioner Insurance company X X X X  
   • Consultations psychiatrist/psychologist/alternative therapist Insurance company X X X X  
   • Medication Insurance company X X X X  
Indirect costs of lost productivity       
   • Net lasting RTW and earnings Database company X    X  
   • Replacement Database company X    X  
Data related to prognostic measures       
I) Personal characteristics       
Gender, Age Database company X     
Severity disorder: DASS/HADS (effect modifier) Questionnaires   X    
Work-relatedness of the disorder Medical files OHS X     
Sick leave in year before inclusion (effect modifier) Database company X     
II) Treatment       
Treating occupational physician (OP) Medical files OHS X     
Diagnosis made by the OP Medical files OHS X     
Guideline adherence of the OP Medical files OHS X X X X  
III) Work characteristics       
Type of function Database company X     
Number of working hours Database company X     
Police constabulary Database company X