Study finds children with autism and ADHD at higher rise for anxiety

March 30, 2018, Kennedy Krieger Institute

Children with both autism spectrum disorder (ASD) and attention-deficit/hyperactivity disorder (ADHD) are at increased risk for being diagnosed with or treated for anxiety and mood disorders, according to a study published in Pediatrics today. The study, completed by the Interactive Autism Network (IAN), is one of the largest to compare comorbidities in individuals with ASD alone to individuals with ASD and ADHD.

For the study's findings, researchers from Kennedy Krieger Institute examined the data of a cross-sectional, network-based survey of ages 6 to 17 years with ASD who were enrolled in the Interactive Autism Network, between 2006 and 2013. Of the 3,319 children in the study, 1,503 (45.3%) had ADHD. The survey data were analyzed for parent-reported diagnosis and/or treatment of ADHD, anxiety disorder, and mood disorders. Children with ASD and ADHD had more than twice (or 2.2 times) the risk of anxiety disorder and 2.7 times the risk of other mood disorders. Researchers also found that these psychiatric conditions were more prevalent in older children.

"We have known that anxiety and are highly prevalent in those with ASD," says Eliza Gordon-Lipkin, MD, [lead] study author and fellow, Department of Neurology and Developmental Medicine, Kennedy Krieger Institute. "This study, however, takes it another step further, providing insights on the differences between children with just ASD versus those with ASD and ADHD. What exactly happens in the human brain that causes children with ASD to have other is not fully understood, but we hope this study inspires other researchers to pursue the answer to this question."

According to recent statistics, ASD affects 1 in 68 children and ADHD affects 1 in 10 in the United States. Researchers and clinicians have long known that these disorders have overlapping features and can occur together, having negative developmental, cognitive, behavioral and functional implications.

"The takeaway from the study's findings, and one that both parents of children with ASD and doctors need to keep in mind, is that managing these psychiatric disorders is a dual effort. That by working closely together in monitoring a child for anxiety and mood symptoms, we can ensure early diagnosis and treatment, which is key to preserving a child's quality of life.," said Paul H. Lipkin, director of Medical Informatics and the Interactive Autism Network at Kennedy Krieger Institute.

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