قصور الانتباه وفرط الحركة
The second, "Attention deficit hyperactivity disorder late birthdate effect common in both high and low prescribing international jurisdictions: a systematic review," published in 2019 examined 22 studies in 13 countries covering 15.4 million children. It found that is the global norm for the youngest students within a school year grade to be diagnosed with and medicated for ADHD than there older classmates.