Table 1.

Measured data and their instruments and timing of data collection

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