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Mild traumatic brain injury (mTBI) occurs in an estimated 692 per 100,000 children younger than 15 years in the U.S. To determine the incidence and natural history of postconcussion symptoms in children with mTBI, researchers at an emergency department in Canada prospectively compared physical, cognitive, emotional, and behavioral symptoms in 670 children with mTBI (age range, 0–18 years) and 197 children with extracranial injury (controls). The definition of mTBI was admission Glasgow Coma Scale score of 13 to 15, loss of consciousness or altered mental status for <20 minutes, absence of focal neurological deficits, and post-traumatic amnesia for <24 hours. Parents completed several questionnaires (including a concussion-specific symptom i…