title: Identification of patients to include in trauma audit: a modification of the pre-chart.
abstract: Trauma audit is commonly focused using a Pre-Chart to illustrate calculations made using the TRISS model. A line is drawn at Ps = 0.5 to divide expected survivors and nonsurvivors. The use of this cut-off in a severely injured population was examined. The 'M statistic' for a group of injured patients selectively triaged to a Trauma Centre was calculated. The ideal cut-off point between predicted outcomes when using the TRISS model to focus trauma audit in this population was determined using a Receiver Operating Characteristic (ROC) curve. For this population the TRISS 'M statistic' was 0.71 (indicating a significantly different case mix from the reference database) and the best cut-off point was at Ps = 0.76. Trauma audit in populations with a case mix of injury severity different from the reference database should use a different Ps line to define unexpected outcomes.
authors.affiliation: Royal London and St Bartholomew's College of Medicine and Dentistry, Whitechapel, UK.
authors.forename: T J
authors.initials: TJ
authors.lastname: Coats
authors.forename: A
authors.initials: A
authors.lastname: MacDonald
mesh_terms: D006801:Humans; D008432:Mathematical Computing; D008485:Medical Audit / Q000458:organization & administration*; D017063:Outcome Assessment, Health Care; D018579:Patient Selection; D012372:ROC Curve; D012720:Severity of Illness Index; D014194:Traumatology / Q000592:standards*; D014218:Triage / Q000706:statistics & numerical data