Psychometric evaluation shows strong reliability and validity of language and living skills assessments for individuals with neurodevelopmental disabilities.
Key Points
The study aims to evaluate the psychometric properties of two assessment tools for reliability and validity in autism spectrum disorder.
Comprehensive psychometric evaluation of ABLLS‐R and AFLS tools.
Analysis of assessment data from 41,912 individuals with multiple administrations.
Evaluation of unidimensionality, reliability, and validity metrics across content areas.
ABLLS‐R and AFLS demonstrated excellent internal consistency (α ≥ 0.88).
Test–retest reliability was fair to excellent for both assessments (ABLLS‐R r xx ≥ 0.40; AFLS r xx ≥ 0.60).
High correlation (r = 0.82) between ABLLS‐R and AFLS total scores.