The SPARK cohort was established to facilitate recruitment in studies of large numbers of participants with autism spectrum disorder (ASD). Online registration requires participants to have received a lifetime professional diagnosis by health or school providers although diagnoses are not independently verified. This study was set to examine the…

The purpose of this study was to examine the measurement properties of the Social Responsiveness Scale in an accelerated longitudinal sample of 4-year-old preschool children with the complementary approaches of categorical confirmatory factor analysis and Rasch analysis. Measurement models based on the literature and other hypothesized measurement…

This study examined the factor structure of the Repetitive Behavior Scale-Revised (RBS-R) in a sample of 287 preschool-aged children with autism spectrum disorder (ASD). A confirmatory factor analysis was used to examine six competing structural models. Spearman's rank order correlations were calculated to examine the associations between factor…

A study of 319 individuals with autism (ages 3-43) and 113 other subjects found that a single set of criteria, as operationalized by individually structured questions in the Autism Diagnostic Interview and Autism Diagnostic Interview-Revised, was effective in differentiating autism from mental disabilities and language impairment. (Author/CR)

Forty-three adolescents with autism and developmental impairments were assessed with the Autism Diagnostic Interview (ADI), DSM-III-R (Diagnostic and Statistical Manual III, Revised) criteria, and the clinician's diagnosis. DSM-III-R criteria for autism exhibited low specificity and agreed poorly with the other two definitions, whereas the ADI was…