Participants
Potential participants were individuals aged 18–60 years, living in Trondheim, and registered with the NAV office participating in the project. Participants had to be on sick leave for ≥8 weeks with a current sick leave status of 50–100% and speak Norwegian. They were excluded from the study if their sick leave was due to pregnancy-related reasons or if they did not have an employer, such as being unemployed or self-employed.