Comparison of Two Multidisciplinary Occupational Rehabilitation Programs Based on Multimodal Cognitive Behavior Therapy on Self-Rated Health and Work Ability.

Objective: Musculoskeletal pain and common mental disorders constitute the largest proportion of people who are on sick leave. This study investigated the efficacy of two multidisciplinary occupational rehabilitation programs on self-rated health and work-related outcomes. The interventions were identical in content but differed in length. It was hypothesized that the longer inpatient program would yield greater improvements than the shorter outpatient program. Methods: Participants were sick-listed workers referred to occupational rehabilitation by the Norwegian Labor and Welfare Administration. A non-randomized 2 Condition (20 days, n = 64 versus 12 days, n = 62) x 4 repeated measures (start, end, 3 months, 12 months) between-subject design was used. Both programs were based on Multimodal Cognitive Behavior Therapy with a return-to-work focus. Health-related questionnaires were the Subjective Health Complaints inventory, Hospital Anxiety and Depression Scale and SF-36 Bodily Pain. Work-related questionnaires were the Work Ability Index, the Fear-Avoidance Beliefs Questionnaire, Return To Work Self-Efficacy and Return To Work expectations. Intervention effects were tested using linear mixed models and effect sizes calculated with Cohen’s d. Results: Results revealed that both groups improved on the selected outcomes. Within-group contrasts and effect sizes showed that the inpatient group showed larger effect sizes at the end of rehabilitation and at 12 months for work-related outcomes, as compared to the outpatient group. Conclusions: Both programs were efficacious in improving health- and work-related outcomes both during and after rehabilitation, but the inpatient group generally displayed stronger and more rapid improvements and that were more stable at one-year post-intervention.