The Swedish version of the Ritvo autism and asperger diagnostic scale: revised (RAADS-R). A validation study of a rating scale for adults

Lisa M J Andersen, Katharina Näswall, Irina Manouilenko, Lena Nylander, Johan Edgar, Riva Ariella Ritvo, Edward Ritvo, Susanne Bejerot, Lisa M J Andersen, Katharina Näswall, Irina Manouilenko, Lena Nylander, Johan Edgar, Riva Ariella Ritvo, Edward Ritvo, Susanne Bejerot

Abstract

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.

Figures

Fig. 1
Fig. 1
Total RAADS-R and domain scores in the comparison cases group and ASD group. a Total RAADS-R. b Subscale: Social interaction. c Subscale: Language. d Subscale: Circumscribed interests. e Subscale: Sensory motor

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