ADHD, Autism, Defiance and Learning Problems Often Overlap in Kids
About 9 in 10 children referred for ADHD or autism had elevated symptoms in at least 2 of 4 areas — ADHD, autism, defiance and learning problems — and the same overlap showed up in ordinary community children at lower rates, according to a 2026 Pennsylvania study based on mothers’ ratings.1 Research Highlights Overlap was …