Outcomes
Study outcomes were assessed at baseline, three months (short-term) and twelve months (long-term). Participants were asked to fill out questionnaires and wear an activity monitor for a week. Participant characteristics such as age, gender, marital status, education level, work situation, duration of complaints, and possible comorbidities were measured at baseline. If participants did not complete the questionnaires, a first reminder was sent after one week and a second reminder or a phone call after two weeks. No financial incentives were offered to complete the measurements.