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Test-Retest Reliability, Measurement Error and Minimal Detectable Change of the Self-Efficacy for Exercise-Brazil in
Maria Tereza Mota Alvarenga1, Ruani Araújo Tenório1, Aline Alvim Scianni1
1Department of Physiotherapy, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
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 ICC3,1. 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 ICC3,1 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.
