Integrated mental health care and vocational rehabilitation to improve return to work rates for people on sick leave because of depression and anxiety (the Danish IBBIS trial): study protocol for a randomized controlled trial

Table 7 Power calculation for linear secondary outcomes

Outcome	δ-Value for clinically relevant difference in mean	σ-Value for expected SD	α	Power	Test	Reference
Difference in depressive symptoms measured by Beck Depression Inventory (BDI)	4	11	0.0167	0.893	t test	[85,86,87,88,89]
Difference in anxiety symptoms measured by Beck Anxiety Inventory (BAI)	4	12	0.0167	0.826	t test	[85,86,87,88,89]
Difference in stress symptoms measured by Cohen et al.’s Perceived Stress Scale (PSS)	5	8	0.0167	1.000	t test	[90,91,92,93,94]
Social and work-related function measured by WSAS	4	10	0.0167	0.946	t test

ISSN: 1745-6215