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 6 Power calculation for binary secondary outcomes

Outcome	Expected proportion in control group	Clinically relevant proportion in intervention group	α	Power	Test	Reference
Proportion achieving > 4 weeks of ordinary job	0.65	0.80	0.0167	0.838	χ² test	[71, 83]
Proportion of > 4 weeks recurrent sick leave absence among participants who returned to work	0.19	0.08	0.0167	0.801	χ² test	[84]

ISSN: 1745-6215