Test–Retest Reliability and Responsiveness of the Computerized Adaptive Test of Social Functioning in Persons With Stroke

Abstract

ObjectiveTo examine the test–retest reliability, minimal detectable change (MDC), responsiveness, and efficiency of the Computerized Adaptive Test of Social Functioning (Social-CAT) in patients with stroke. DesignRepeated-assessments design. SettingA department of rehabilitation of a medical center. ParticipantsIn total, 31 patients with chronic stroke and 65 patients with subacute stroke were recruited. InterventionNot available. Main Outcome MeasureSocial-CAT. ResultsThe Social-CAT showed acceptable test–retest reliability (intraclass correlation coefficient, 0.80) and small random measurement error (MDC%: 18.0%). However, heteroscedasticity was found (r between the means and the absolute change scores: 0.32), so the MDC% adjusted cut-off score is recommended for determining real improvement. Regarding responsiveness, the Social-CAT showed large differences (Kazis’ effect size and standardized mean response: 1.15 and 1.09, respectively) in subacute patients. Regarding efficiency, the Social-CAT required an average of 5 items and less than 2 minutes for completion. ConclusionsOur findings indicate that the Social-CAT is a reliable and efficient measure with good test–retest reliability, small random measurement error, and good responsiveness. Thus, the Social-CAT is a useful outcome measure for routine monitoring of the changes in social function of patients with stroke.