Convergent and discriminant validity established with the IBS Satisfaction With Care Scale
THURSDAY, Dec. 1 (HealthDay News) -- The irritable bowel syndrome (IBS) Satisfaction With Care Scale (IBS-SAT) is a validated measure of patient satisfaction with IBS care, which exhibits high internal consistency, and convergent and discriminant validity, according to a study published in the December issue of Clinical Gastroenterology and Hepatology.
Spencer D. Dorn, M.D., M.P.H., from the University of North Carolina at Chapel Hill, and colleagues developed a standard measure of satisfaction with IBS care from the patients' perspective. Focus groups were used to identify items that patients associated with satisfaction in their IBS care, which were refined through pilot testing and cognitive debriefing. The resulting instrument and external validation measures were administered to 300 adult patients with IBS. Clinically relevant subscales and psychometric properties were assessed by factor analysis. The resulting IBS-SAT comprised 38 items from five clinically relevant subscales.
The investigators found that there was a high level of internal consistency with the IBS-SAT. The correlations between the IBS-SAT and a single, global satisfaction with care question, and a generic, multi-item satisfaction scale established convergent validity. Stratification of groups on the basis of IBS-quality of life, IBS severity, and number of unmet expectations established discriminant validity.
"The IBS-SAT is a validated measure of patient satisfaction with IBS care," the authors write.
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