In a study of the co-occurrence of attention deficit hyperactivity disorder (ADHD) and autism spectrum disorder (ASD) in early school-age children (four to eight years old), researchers at the Kennedy Krieger Institute found that nearly one-third of children with ASD also have clinically significant ADHD symptoms. Published in Autism: The International Journal and Practice (Epub ahead of print), the study also found that children with both ASD and ADHD are significantly more impaired on measures of cognitive, social and adaptive functioning compared to children with ASD only...
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