Skip to main content

Table 6 Power calculation for binary secondary outcomes

From: 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

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]