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O'Neil ME, Carlson K, Storzbach D, et al. Complications of Mild Traumatic Brain Injury in Veterans and Military Personnel: A Systematic Review [Internet]. Washington (DC): Department of Veterans Affairs (US); 2013 Jan.

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Complications of Mild Traumatic Brain Injury in Veterans and Military Personnel: A Systematic Review [Internet].

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Table A-1Classification of TBI Severity

CriteriaMildModerateSevere
Structural imagingNormalNormal or abnormalNormal or abnormal
Loss of Consciousness (LOC)0–30 min> 30 min and < 24 hrs> 24 hrs
Alteration of consciousness/mental state (AOC)a moment up to 24 hrs> 24 hours. Severity based on other criteria
Post-traumatic amnesia (PTA)0-1 day> 1 and < 7 days> 7 days
Glasgow Coma Scale (best available score in first 24 hours)13-159-12< 9

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