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Direct linkFrazier, Thomas W.; Hardan, Antonio Y. – Autism: The International Journal of Research and Practice, 2017
This study investigated equivalence of autism symptom domains in males and females with autism. Symptom data were obtained from 2643 children and adolescents with autism spectrum disorder (352 females, 2291 males; age range = 4-17 years) included in the Simons Simplex Collection. Items from the Social Responsiveness Scale and Autism Diagnostic…
Descriptors: Symptoms (Individual Disorders), Autism, Children, Adolescents
Frazier, Thomas W.; Thompson, Lee; Youngstrom, Eric A.; Law, Paul; Hardan, Antonio Y.; Eng, Charis; Morris, Nathan – Journal of Autism and Developmental Disorders, 2014
The present study examined genetic and shared environment contributions to quantitatively-measured autism symptoms and categorically-defined autism spectrum disorders (ASD). Participants included 568 twins from the Interactive Autism Network. Autism symptoms were obtained using the Social Communication Questionnaire and Social Responsiveness…
Descriptors: Genetics, Twins, Qualitative Research, Autism
Frazier, Thomas W.; Youngstrom, Eric A.; Embacher, Rebecca; Hardan, Antonio Y.; Constantino, John N.; Law, Paul; Findling, Robert L.; Eng, Charis – Autism: The International Journal of Research and Practice, 2014
Demographic and clinical factors may influence assessment of autism symptoms. This study evaluated these correlates and also examined whether social communication and interaction and restricted/repetitive behavior provided unique prediction of autism spectrum disorder diagnosis. We analyzed data from 7352 siblings included in the Interactive…
Descriptors: Demography, Pervasive Developmental Disorders, Autism, Symptoms (Individual Disorders)
Frazier, Thomas W.; Youngstrom, Eric A.; Kubu, Cynthia S.; Sinclair, Leslie; Rezai, Ali – Journal of Autism and Developmental Disorders, 2008
The factor structure of the Autism Diagnostic Interview-Revised (ADI-R) algorithm items was examined using exploratory (EFA) and confirmatory factor analyses (CFA) factor methods. The ADI-R was completed for 1,170 youths and adults (ages 2-46). Results of EFAs indicated strong support for two-factor structure, with social communication and…
Descriptors: Autism, Factor Structure, Factor Analysis, Clinical Diagnosis
