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The Danish Ibbis Trials for Sickness Absentees with Common Mental Disorders: A Phase 4 Prospective Study Comparing
Andreas Hoff1, Anders Bo Bojesen1, Lene Falgaard Eplov1
1Copenhagen Research Unit for Recovery, Mental Health Services, Capital Region Denmark, Copenhagen University Hospital, Hans Bogbinders Allé3, 3. sal, 2300 København S, Denmark.
Introduction:
In two randomized controlled trials (RCT) we tested the efficacy of a novel integrated vocational rehabilitation and mental healthcare intervention, coined INT, for sickness absentees with common mental disorders. The aim was to improve vocational outcomes compared to Service As Usual (SAU). Contrary to expectations, the delivered intervention caused worse outcomes within some diagnostic groups and some benefits in others. In this phase 4 study, we examined the effectiveness of the intervention in real-world practice.
Method:
In this prospective intervention study, we allocated adult sickness absentees with either depression, anxiety, or adjustment disorder to receive INT in a real-world setting in a Danish Municipality. We compared the vocational outcomes of this group to a matched group who received INT as a part of the RCTs, after randomization to the intervention group herein. Primary outcome was return to work at any point within 12 months.
Results:
In the real-world group, 151 participants received INT during 2019. From the randomized trials, 302 matched participants who received INT between 2016-2018 were included. On the primary outcome - return to work within 12 months - the real-word group fared worse (48.3 vs 64.6 %, OR 0.54 [95%CI: 0.37-0.79], p = 0.001). Across most other vocational outcomes, a similar pattern of statistically significant poorer outcomes in the real-world group was observed: Lower number of weeks in work and lower proportion in work at 12 months (42.3% vs. 58.3% (p = 0.002)).
Discussion:
The real-word group showed significantly worse vocational outcomes. Like in many other studies of complex interventions, implementation was difficult in the original randomized trials and perhaps even more difficult in the less structured real-world setting. Since the intervention was less effective for some groups compared to SAU in the original trial, this negative effect may be even more pronounced in a real-world setting.
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