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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.
Summary
The Self-Efficacy for Exercise-Brazil scale shows good reliability for assessing exercise confidence in stroke survivors. Changes of three points or more on this scale may indicate a true improvement in self-efficacy.
Area of Science:
- Rehabilitation Medicine
- Neuroscience
- Psychology
Background:
- Assessing exercise self-efficacy in post-stroke individuals in Brazil requires reliable tools.
- The Self-Efficacy for Exercise-Brazil scale is a potential instrument for this population.
Purpose of the Study:
- To evaluate the test-retest reliability of the Self-Efficacy for Exercise-Brazil scale.
- To determine measurement error and minimal detectable change for this scale in stroke survivors.
Main Methods:
- The Self-Efficacy for Exercise-Brazil scale was administered twice to 50 stroke survivors (mean age 61 years) over 4-10 days.
- Intraclass correlation coefficient (ICC3,1) assessed reliability.
- Standard error of measurement (SEM) and minimal detectable change (MDC) quantified error.
Main Results:
- Excellent test-retest reliability was found, with an ICC3,1 of 0.85.
- The SEM was 1.08 points (20% of the scale).
- The MDC was calculated as 2.99 points.
Conclusions:
- The Self-Efficacy for Exercise-Brazil scale demonstrates adequate test-retest reliability for post-stroke individuals.
- Moderate measurement error was identified.
- A change of approximately three points or more is needed to signify a true change in exercise self-efficacy.
