Concurrent Validity of the ABAS-II Questionnaire with the Vineland II Interview for Adaptive Behavior in a Pediatric ASD Sample: High Correspondence Despite Systematically Lower Scores.

The team gave 62 parents of kids with autism two forms on the same day. First they filled out the ABAS-II questionnaire at home. Then a clinician gave the Vineland-II interview by phone.

They compared scores in the three main domains: communication, daily living, and social skills. The goal was to see if the quick paper form could replace the long interview.

The two tools lined up almost perfectly. Correlations ran 0.89-0.93, which is sky-high for behavior checklists.

ABAS-II scores ran 5-7 points lower, but the gap was steady. If a child scored above 80 on ABAS-II, the Vineland-II almost never dropped below 70, the cutoff for services.

Green et al. (2020) saw the same pattern when they compared Vineland-II and Vineland-III. The newer edition also gave lower numbers, so the drop is not unique to ABAS-II.

Dudley et al. (2019) found low overlap between Vineland and IQ tests. Annie et al. now show high overlap between two adaptive measures. Together they tell us: test adaptive skills separately from IQ, but feel free to swap adaptive tools.

de Bildt et al. (2005) proved Vineland-II is reliable in ID samples. Annie et al. extend that work to autism and add a time-saving twist: start with the short form.

You can cut assessment time in half. Hand the ABAS-II to parents while they wait. If domain scores top 80, skip the Vineland-II interview unless you need the detail for an eligibility fight. You keep accuracy, save an hour, and free up staff for treatment.