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Adaptive Behavior Diagnostic Scale
by Nils A. Pearson, James R. Patton & Daniel W. Mruzek
Age Range: 2 - 21 years
Testing Time: 30 minutes
The Adaptive Behavior Diagnostic Scale (ABDS) is an interview-based rating scale that assesses the adaptive behaviour of individuals between the ages of 2 through 21 years. The primary function of the ABDS is to establish the presence and the magnitude of adaptive behaviour deficits. The ABDS scores are compatible with state and federal special education classification systems and consistent with the DSM-V and American Association on Intellectual and Developmental Disorders (AAIDD) definitions of intellectual disability. The ABDS may be used to assess the adaptive behaviour of individuals with or suspected of having intellectual disability, autism spectrum disorder, learning disabilities, mental or behavioural health condition or other similar concerns.
Norms for the ABDS are based on a nationally representative sample of 1,061 children and adolescents who reside in the U.S. The internal consistency reliability coefficients of the domain and composite scores were all above .90 for all age and disability groups. A study of the diagnostic accuracy, a highly rigorous validity technique, is reported with regards to sensitivity (.85), specificity (.99), classification accuracy (.98), and receiver operating characteristic/area under the curve (.99).