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PHILADELPHIA (CBS) — Children who enter elementary school a year younger than their peers are 30 percent more likely to be diagnosed with attention deficit disorder.
That’s according to a study at Harvard Medical School that looked at children in states with a September enrollment cutoff.
Researchers found children with August birthdays were often a full year younger than classmates and had a harder time sitting still.
They say factoring in a child’s age when assessing behavior is key.