Younger children in a school grade cohort may be more likely to receive a diagnosis of attention deficit–hyperactivity disorder (ADHD) than their older peers because of age-based variation in behavior that may be attributed to ADHD rather than to the younger age of the children. Most U.S. states have arbitrary age cutoffs for entry into public school. Therefore, within the same grade, children with birthdays close to the cutoff date can differ in age by nearly 1 year.
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September 30, 2017
This Deep-Red State Decided to Make a Serious Investment in Preschools. It’s Paying Off Big-Time. – Mother Jones
January 3, 2019
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