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Objective: To describe the organization, content and dosage of interdisciplinary pain rehabilitation, and the differences in degree of severity of problems of patients admitted to clinical units reporting to a Swedish national quality pain registry, grouped according to unit size and possible affiliation with a university hospital.

Methods: Reports from 31 out of 39 clinical units in Sweden, on inclusion processes, organization, content and dosage of interdisciplinary pain rehabilitation, and patient-reported data from a Swedish national quality pain registry at assessment for interdisciplinary pain rehabilitation were analysed.

Results: the number of patients treated annually at each unit ranged from 3 to 340. In 17 units, teams comprised 5 professionals. Dosage of interdisciplinary pain rehabilitation ranged from 20-180 h per patient in total. Patients at the university-hospital units scored the highest levels of symptoms and lowest levels of health related quality of life. Units used similar sets of inclusion criteria, and several treatments, such as education, self-training and psychological interventions, were used by most units.

Conclusion: When interpreting outcome data from registries, aspects other than rehabilitation out-comes must be considered. The interpretation of outcomes from quality registries would be facilitated if data, in addition to assessments and patient reported outcomes, also includes standardized descriptions of the reporting clinical units.