Fig. 1From: Nationwide improvements in geriatric mortality due to traumatic brain injury in JapanFlowchart of the selection of patients included in this study. *Multiple trauma: TBI and AIS ≥3 for injury in other areas. TBI = traumatic brain injury, JTDB = Japan Trauma Data Bank, AIS = Abbreviated Injury Scale, GCS = Glasgow Coma ScaleBack to article page