Table 3.

Primary and secondary outcomes and data collection

	Data source	Outcome	Baseline	6-month follow-up	12-month follow-up	24-month follow-up
Primary	DREAM database	Time from baseline to RTW			X
Secondary	DREAM database	Proportion in ordinary work			X
	DREAM database	Time from baseline to RTW		X		X
	DREAM database	Time from the first day of RTW until possible recurrent sick leave				X
	Questionnaire	Difference in depressive symptoms measured by Beck Depression Inventory (BDI-II) [52]	X	X
	Questionnaire	Difference in anxiety symptoms measured by Beck Anxiety Inventory (BAI) [55]	X	X
	Questionnaire	Difference in stress symptoms measured by Cohen Perceived Stress 10-item Scale (PSS) [77]	X	X
	Questionnaire	Social and work-related function measured by WSAS [57]	X	X

RTW return to work, WSAS Work and Social Adjustment Scale