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Concordance of the Adaptive Behavior Assessment System, second and third editions.

A M von Buttlar^1,2, T A Zabel^1,2, A E Pritchard^1,2

¹Department of Neuropsychology, Kennedy Krieger Institute, Baltimore, MD, USA.

Journal of Intellectual Disability Research : JIDR

|January 6, 2021

Summary

The Adaptive Behavior Assessment System (ABAS) third edition (ABAS-3) scores are higher than the second edition (ABAS-2) in clinical samples. Understanding these differences is crucial for accurate interpretation of adaptive functioning assessments over time.

Keywords:

adaptive behaviour concordance developmental disorder intellectual disability psychometrics reliability

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Area of Science:

Psychology
Developmental Psychology
Clinical Psychology

Background:

Adaptive functioning assessments are vital for diagnosis, educational planning, and legal evaluations.
Ensuring the relevance of adaptive functioning measures requires periodic updates and understanding version equivalence.
Equivalence data is essential for tracking changes in adaptive skills over time.

Purpose of the Study:

To examine the equivalence between the second (ABAS-2) and third (ABAS-3) editions of the Adaptive Behavior Assessment System.
To compare scores from ABAS-2 and ABAS-3 in mixed clinical samples using between-group and within-group designs.

Main Methods:

Two studies were conducted comparing ABAS-2 and ABAS-3 scores in clinically referred children.
Study 1 used between-group comparisons of large samples assessed on either ABAS-2 or ABAS-3.
Study 2 used within-group comparisons of children assessed on both ABAS-2 and ABAS-3.

Main Results:

No significant differences in IQ scores were found between ABAS-2 and ABAS-3 groups.
ABAS-2 scores were consistently lower than ABAS-3 scores across Conceptual, Practical, and General Adaptive Composite scales in both studies.
The Practical composite showed the largest score difference and lowest concordance between ABAS versions.

Conclusions:

ABAS-3 scores tend to be higher than ABAS-2 scores in clinical populations.
Awareness of score discrepancies between ABAS versions is critical for accurate interpretation in clinical, educational, and forensic contexts.
These findings highlight the need for careful consideration when interpreting changes in adaptive functioning scores across different ABAS editions.