ALMOST one million American children with attention deficit hyperactivity disorder (ADHD) may have been misdiagnosed, scientists revealed today.
In a study of nearly 12,000 children, researchers from Michigan State University found the youngest kindergarten pupils were 60 percent more likely to be diagnosed with ADHD than the oldest children in the same grade.
In another study released yesterday, researchers from North Carolina State University examined national health data spanning 10 years and came to a similar conclusion.
Both studies found large discrepancies in diagnosis and treatment rates based on small differences in children's dates of birth - with children born just after kindergarten eligibility cutoff dates more likely to be given the ADHD label. [...]