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Prominent concerns exist about potential long-term sequelae of traumatic brain injuries, whether in civilian or military populations. Using national Danish registries on 113,906 individuals born in 1977–2000 who received an inpatient or emergency-department diagnosis of head injury, investigators examined associations between head injury and later psychiatric diagnoses (defined as first diagnosis after age 10 in 1987–2010). Some industry support was provided.
Mild injury was defined as loss of consciousness for 30 minutes or less, Glasgow Coma Scale score of 14 or higher at 30 minutes, and any post-traumatic amnesia lasting less than 24 hours. In analyses adjusting for sex, age, family psychiatric histories, epilepsy, infections (excluding A…