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. Continue reading.
Over the past 15 years, the share of 4-year-olds who are U.S. residents attending public preschool has more than doubled to 33 percent. Continue reading.
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