The Swedish Version of the Ritvo Autism and Asperger Diagnostic Scale: Revised (RAADS-R). A Validation Study of a Rating Scale for Adults

Department of Psychology, Stockholm University, Stockholm, Sweden.
Journal of Autism and Developmental Disorders (Impact Factor: 3.06). 02/2011; 41(12):1635-45. DOI: 10.1007/s10803-011-1191-3
Source: PubMed


There is a paucity of diagnostic instruments for adults with autism spectrum disorder (ASD). This study evaluates the psychometric properties of the Swedish version of the Ritvo Autism and Asperger Diagnostic Scale-Revised (RAADS-R), an 80-item self-rating scale designed to assist clinicians diagnosing ASD in adults. It was administered to 75 adults with ASD and 197 comparison cases. Also, a subset completed the Autism Spectrum Quotient (AQ). Three out of four subscales had high internal consistency. Sensitivity was 91% and specificity was 93%. The ASD subjects had significantly higher mean scores on all subscales. ASD females had higher scores than ASD males on the sensory motor subscale, a dimension not included in the AQ. RAADS-R showed promising test re-test reliability.

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Available from: Susanne Bejerot, Feb 17, 2014
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    • "Based on the results from the Swedish validation of RAADS-R [9], 18 items that differentiated ASD participants from non-psychiatric controls were selected. In order to maintain content validity [10], items were selected in proportions corresponding to the original RAADS-R domains, in a number that would fit into a one-page questionnaire. "
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    • "The RAADS-R is self-administered and consists of four subscales (Social Interaction, Language, Circumscribed Interests and Sensory Motor Symptoms). However, the language sub-scale was excluded in this study since it showed low internal consistency in a Swedish validation study (Andersen et al., 2011). RAADS-R assesses deficits in perception and sensory-motor integration along with cognitive aspects of ASD. "
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