• Carlos De las Cuevas, Lilisbeth Perestelo-Perez, Amado Rivero-Santana, Ausiàs Cebolla-Martí, Isabelle Scholl, and Martin Härter.
• Department of Psychiatry, University of La Laguna, Canary Islands, Spain.
• Health Expect. 2015 Dec 1; 18 (6): 2143-53.

ObjectiveTo translate and assess the psychometric properties of the 9-item Shared Decision-Making Questionnaire (SDM-Q-9) for measuring patients' perceptions of how clinicians' performance fits the SDM process.DesignCross-sectional study.Setting And ParticipantsData were collected in primary care health centres. Patients suffering from chronic diseases and facing a medical decision were included in the study.MeasurementsThe original German SDM-Q-9 was translated to Spanish using the process of cross-cultural adaptation of self-reported measures as the methodological model for Spanish translation. Reliability (internal consistency) and construct validity [exploratory (EFA) and confirmatory factor analysis (CFA)] were assessed.ResultsThe final Spanish version of the SDM-Q-9 was tested in a primary care sample of 540 patients. The SDM-Q-9 presented adequate reliability and acceptable validity. Internal consistency yielded a Cronbach's alpha of 0.885 for the whole scale. EFA showed a two-factorial solution, and for the CFA, the best solution was obtained with a one-dimensional factor with the item 1 excluded, which produced the best indexes of fit.Discussion And ConclusionsThe Spanish version of the SDM-Q-9 showed adequate reliability and acceptable validity parameters among primary care patients. The SDM-Q-9 is suitable for use in Spain and other Spanish-speaking countries with similarly organized health-care systems. The use of the SDM-Q-9 may contribute to the evaluation of SDM process from the patient's perspective.© 2014 John Wiley & Sons Ltd.

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