The Ritvo Autism Asperger Diagnostic Scale-Revised (RAADS-R): A scale to assist the diagnosis of Autism Spectrum Disorder in adults: An international validation study

Riva Ariella Ritvo, Edward R Ritvo, Donald Guthrie, Max J Ritvo, Demetra H Hufnagel, William McMahon, Bruce John Tonge, David Mataix-Cols, Amita Jassi, Tony Attwood, Johann Eloff

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Abstract

The Ritvo Autism Asperger Diagnostic Scale-Revised (RAADS-R) is a valid and reliable instrument to assist the diagnosis of adults with Autism Spectrum Disorders (ASD). The 80-question scale was administered to 779 subjects (201 ASD and 578 comparisons). All ASD subjects met inclusion criteria: DSM-IV-TR, ADI/ADOS diagnoses and standardized IQ testing. Mean scores for each of the questions and total mean ASD vs. the comparison groups scores were significantly different (p <.0001). Concurrent validity with Constantino Social Responsiveness Scale-Adult = 95.59 . Sensitivity = 97 , specificity = 100 , test-retest reliability r = .987. Cronbach alpha coefficients for the subscales and 4 derived factors were good. We conclude that the RAADS-R is a useful adjunct diagnostic tool for adults with ASD
Original languageEnglish
Pages (from-to)1076 - 1089
Number of pages14
JournalJournal of Autism and Developmental Disorders
Volume41
Issue number8
DOIs
Publication statusPublished - 2011

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