Although frequently observed in individuals with ASD, little is known about the nature of developmental regression amongst this population. Previous studies have found varying results in differences in ASD symptoms, cognitive functioning, and comorbid problems between individuals who have and have not regressed in skills. The purpose of the present study was to examine potential differences in ASD symptom domains (i.e., nonverbal communication/socialization, verbal communication, social relationships, insistence on sameness/restricted interests) and challenging behaviors across groups. Participants included 160 total children with ASD (M = 8.17, SD = 4.12), of which 70 reported a history of developmental regression. Results indicated significant differences between groups on ASD severity, nonverbal communication/socialization, verbal communication, social relationships, and internalizing problems. No difference was found on insistence on sameness/restricted interests and externalizing problems. Implications of these data are discussed.
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