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

The study used convenience samples of clinically referred children, so the results may not apply to children who are not in clinical care. The order of tests was not randomised; the ABAS-2 was always used first and the ABAS-3 second, which could introduce bias if children improved over time due to maturation or intervention. The researchers could not confirm diagnoses because the data relied on billing codes, using IQ scores as a proxy for risk of intellectual disability instead. Participants were only included if they had complete data, which might exclude children with more complex or incomplete assessments.

The authors reported no real or potential conflicts of interest.

Do not interpret higher ABAS-3 scores as evidence of functional improvement or treatment success. The increase is likely a testing artefact caused by the version change, particularly in practical skills, and does not reflect actual gains in the child's abilities.