​ Cultural adaptation of the Rheumatoid Arthritis Quality of Life (RAQoL) for Portugal.

Background: Rheumatoid Arthritis (RA) is a chronic inflammatory disease that has a major impact on patients´ quality of life. The Rheumatoid Arthritis Quality of Life (RAQoL) questionnaire is a patient-reported outcome measure, specific to RA. The aim of this study was to translate and perform the cross-cultural adaptation of the RAQoL into Portuguese. Material and Methods: The dual panel methodology was used to translate the UK RAQoL into Portuguese. This involved conducting a bilingual panel (providing the initial translation into Portuguese) followed by a lay panel (where items are assessed for comprehension and acceptability). Cognitive debriefing interviews were conducted with Portuguese RA patients to determine the face and content validity of the translated scale. Results: The translation panels produced a Portuguese version of the RAQoL that was easily understood and considered natural by native speakers. Twelve RA patients participated in the cognitive debriefing interviews. Patients considered the translated questionnaire to be clear, relevant and appropriate. Conclusion: The Portuguese version of the RAQoL was found to be comprehensible and demonstrated excellent face and content validity. Research examining the psychometric properties of this Portuguese version of the RAQoL is underway.