Test‐Retest Reliability, Measurement Error and Minimal Detectable Change of the Self‐Efficacy for Exercise‐Brazil in Individuals After Stroke

ABSTRACT Background and Purpose Identifying reliable methods to assess exercise self‐efficacy among individuals after stroke in Brazil is important. The purpose of the present study was to examine the test‐retest reliability, measurement error, and minimal detectable change of the Self‐Efficacy for Exercise‐Brazil in individuals after stroke. Methods The Self‐Efficacy for Exercise‐Brazil scale was administered twice to each participant by trained researchers, with an interval of 4–10 days between assessments. Test–retest reliability was evaluated using the ICC 3,1 . Measurement error was quantified by the standard error of measurement (SEM) and its percentage (SEM%), while the minimal detectable change (MDC) was calculated to identify the smallest score variation representing a true difference beyond measurement error. Results Fifty individuals after stroke were included, with a mean age of 61 years. The ICC 3,1 was 0.85 (95% CI = 0.75–0.91), the SEM was 1.08 points, the percentage of SEM was 20%, and the MDC was 2.99 points. Discussion The Self‐Efficacy for Exercise‐Brazil has adequate test–retest reliability after stroke. Moderate measurement error was observed, and changes of three points or more may reflect a true change.