| Summary: | Abstract Clinical tests for the assessment of postural balance in people with intellectual disability have been the most commonly used single or multi-item tests, but some tests have been developed, such as the BESTest. The purpose of the study was to evaluate the test–retest reliability and limits of agreement of the Balance Evaluation Systems Test (BESTest) in young people with intellectual disabilities. A descriptive cross-sectional study was conducted with 65 young people (ages 16–25 years) with intellectual disability. The participants completed the BESTest (27 items) twice. Intraclass correlation coefficients (ICC), 95% confidence intervals (CIs), and standard error of measurement (SEM) were calculated to determine the test–retest reliability of the BESTest. The BESTest overall scores' test–retest reliability was rated as excellent (≥ 0.75). Stability limits/verticality and reactive are fair to good (≥ 0.40– < 0.75). Biomechanical constraints, transitions and anticipatory movements, sensory orientation, and gait stability were excellent (≥ 0.75). Current evidence shows that young people with intellectual disabilities have impaired postural balance. However, there appears to be a lack of assessment tools that reliably evaluate the postural balance of this population. The results from this investigation show that BESTest provides "excellent reliability" (≥ 0.75) to assess postural balance in young people with intellectual disability.
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