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Background: Teenage youth with co-morbid intellectual disability (ID) and autism spectrum disorder (ASD) could be at higher risk for behavioral and social difficulties than youth with ID only. Methods: Youth aged 13 years were diagnosed with ID (n = 37), ID/ASD (n = 26), or typical development (TD, n = 98). Mothers and teachers completed measures of youth behavior problems, mental health, social skills, friendships, and their own well-being. Results: ID/ASD youth were at heightened risk across almost all measures when compared with TD youth. On 14 of the 38 domains assessed, ID/ASD youth had significantly more difficulties than youth with ID only. Most notably, they scored higher on internalizing problems and lower on friendships and peer acceptance. Their mothers reported lower well-being for themselves. Conclusion: Compared to families of youth with ID only, youth with combined ID/ASD experienced greater psychological and social difficulties and their mothers experienced lower-well-being.

Dual diagnosis of autism spectrum disorder (ASD) and behavior problems and/or mental disorders has become increasingly recognized and studied. Reported rates in samples of mixed-age youth with ASD are often above 70%, making this comorbidity more the rule than the exception. The present study compared rates of disruptive behavior disorder diagnosis in a sample of 13-year-old adolescents with ASD (n = 58), intellectual disability (ID; n = 40), or typical cognitive development (TD; n = 100). In youth without ASD, there was a high negative correlation between IQ and disruptive behavior disorders, assessed with the Child Behavior Checklist (CBCL) and the Diagnostic Interview Schedule for Children (DISC). In youth with ASD, however, the presence of a comorbid disruptive behavior disorder was unrelated to IQ, indicating that higher intelligence was not a protective factor for disruptive behavior disorders (DBDs) in ASD. On four CBCL scales and two DISC scales examined, youth with ASD had significantly higher rates than TD youth, though not generally higher than youth with ID. The most commonly diagnosed comorbid disorder in the early adolescents with ASD was attention-deficit/hyperactivity disorder. This has implications for planning school-based interventions, particularly for high-functioning children with ASD who are more likely to be fully included in general education.

Background: Teenage youth with co-morbid intellectual disability (ID) and autism spectrum disorder (ASD) could be at higher risk for behavioral and social difficulties than youth with ID only. Methods: Youth aged 13 years were diagnosed with ID (n = 37), ID/ASD (n = 26), or typical development (TD, n = 98). Mothers and teachers completed measures of youth behavior problems, mental health, social skills, friendships, and their own well-being. Results: ID/ASD youth were at heightened risk across almost all measures when compared with TD youth. On 14 of the 38 domains assessed, ID/ASD youth had significantly more difficulties than youth with ID only. Most notably, they scored higher on internalizing problems and lower on friendships and peer acceptance. Their mothers reported lower well-being for themselves. Conclusion: Compared to families of youth with ID only, youth with combined ID/ASD experienced greater psychological and social difficulties and their mothers experienced lower-well-being. [ABSTRACT FROM AUTHOR]