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Concurrent validity of the ABAS-II questionnaire with the Vineland II interview for adaptive behaviour in a pediatric ASD sample: High correspondence despite systematically lower scores

We examined the correlation between interviewer-administered Vineland Adaptive Behavior Scale II (VABS-II) and the parent-rated Adaptive Behavior Assessment System II (ABAS-II) questionnaire in 352 participants (ages 1.5-20.8 years) with autism …