[Spanish version of the Satisfaction With Decision scale: cross-cultural adaptation, validity and reliability]

Objective: The aim of this study is to develop a Spanish version of the Satisfaction With Decision scale (SWDs) and analyse the psychometric properties of validity and reliability.

Design: An observational, descriptive study and validation of a tool to measure satisfaction with the decision.

Setting: Urology, Radiation oncology, and Medical oncology Departments of the Hospital Universitari Germans Trias i Pujol, Institut Català d'Oncologia and the Institut Oncològic del Vallès - Hospital General de Catalunya.

Participants: A total of 170 participants diagnosed with prostate cancer, and who could read and write in Spanish and gave their informed consent.

Main measurements: A translation, back-translation and cross-cultural adaptation to Spanish was performed on the SWDs. The content validity, criterion validity, construct validity and reliability (internal consistency and stability) of the Spanish version were evaluated.

Results: The SWDs contains 6 items with 5-item Likert scales. A Spanish version (ESD) was obtained that was linguistically and conceptually equivalent to the original version. Criterion validity, the ESD correlated with "satisfaction with the decision" using a linear analogue scale, was significant (r=0.63, P<.01) for all items. The factorial analysis showed a unique dimension to explain 82.08% of the variance. The ESD showed excellent results in terms of internal consistency (Cronbach alpha=0.95) and good test-retest reliability with intraclass correlation coefficient of 0.711.

Conclusions: The ESD is a validated Spanish scale to measure the satisfaction with the decisions taken in health, and demonstrates a correct validity and reliability.