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Chronic pain (>3 months) is associated with work limitations and sick leave. This thesis aimed to evaluate assessments and interventions targeting work disability for individuals at risk of or with chronic pain. Specific aims for studies I and II were to compare the preventive effects of a brief psychosocial program with an active educational control. Study III aimed to evaluate the construct validity and internal consistency of the Work Ability Index (WAI). Study IV aimed to systematically replicate a behavioral medicine physiotherapy intervention within a return-to-work context and evaluate its effects on an individual level.  

Methods: Studies I and II were based on a cluster-randomized controlled trial, including 191 employees with reported pain and/or stress-related ill-health and 53 supervisors. Study I reported on the primary outcome of sick leave and secondary health-related outcomes on employees at 6-months follow-up; study II reported on the supervisors’ communication behavior and perceived stress. Study III was a cross-sectional study including 118 patients with chronic pain referred to specialized care. Study IV was a single case experimental design study including five participants with chronic pain on long-term sick leave. 

Results: In studies I and II, no effects of the brief psychosocial program were found on outcomes on employees or supervisors. In study III, the construct validity and internal consistency of the WAI were supported. In study IV, the physiotherapy protocol was successfully replicated, and the results indicated an effect on task-specific self-efficacy for target activities at work, but not on experience of target activities or work ability.

Conclusion: The results highlight the importance of selecting participants for preventive workplace interventions based on their assessed risk profiles for long-term pain disability, and that targeting mainly the supervisors might be insufficient. The WAI appears to be a valid measurement of work ability for patients with chronic pain in specialized care. Accordingly, behavioral medicine physiotherapy can be successfully adapted to work disability needs for patients with chronic pain. Large-scale trials are needed to evaluate its effects on return-to-work. A behavioral medicine perspective on pain disability in a work context motivates a focus on target activities at work, which can be seen to mediate the incorporation of behavioral knowledge in assessments and interventions for individuals with pain.