- Adults and children with physical trauma who: 1) are transported directly to or are transferred to a level I TC by participating EMS agencies, 2) have hospital diagnosis(es) consistent with TBI (either isolated or multisystem trauma that includes TBI), and 3) meet at least one of the following definitions for severe TBI: a) last prehospital GCS or first hospital/trauma center GCS <9; b) AIS-head of ≥3, c) CDC Barell Matrix-Type 1, d) undergo prehospital ETI, nasal intubation, or cricothyrotomy.