 The study population of interest was psychiatric in- or outpatients from Aarhus University Hospital , Risskov, some of whom were referred for physiotherapeutic treatment. The patients were compared with healthy controls matched on gender and age, recruited from hospital staff including administrative employees.Patients and controls were included in the study after giving informed consent, according to the Declaration of Helsinki 2008. All participants assessed their physical activity level by completing the PAS questionnaire twice within a time period of 5-7 days for evaluation of the test-retest reliability of PAS. For patients, PAS was administered as an interview, and for controls as a self-questionnaire. Several physiotherapists PTs were involved in interviewing the patients. 