Multiple trauma scores have been developed and validated, including the Revised Trauma Score (RTS) and the Mechanism, Glasgow Coma Scale, Age, and Arterial Pressure (MGAP) score. However, these scores are complex to calculate or have low prognostic abilities for trauma mortality. Therefore, we aimed to develop and validate a trauma score that is easier to calculate and more accurate than the RTS and the MGAP score.
The study was a retrospective prognostic study. Data from patients registered in the Japan Trauma Databank (JTDB) were dichotomized into derivation and validation cohorts. Patients\' data from the Clinical Randomisation of an Antifibrinolytic in Significant Haemorrhage-2 (CRASH-2) trial were assigned to another validation cohort. We obtained age and physiological variables at baseline, created ordinal variables from continuous variables, and defined integer weighting coefficients. Score performance to predict all-cause in-hospital death was assessed using the area under the curve in receiver operating characteristics (AUROC) analyses.
Based on the JTDB derivation cohort (n = 99,867 with 12.5% mortality), the novel score ranged from 0 to 14 points, including 0-2 points for age, 0-6 points for the Glasgow Coma Scale, 0-4 points for systolic blood pressure, and 0-2 points for respiratory rate. The AUROC of the novel score was 0.932 for the JTDB validation cohort (n = 76,762 with 10.1% mortality) and 0.814 for the CRASH-2 cohort (n = 19,740 with 14.6% mortality), which was superior to RTS (0.907 and 0.808, respectively) and MGAP score (0.918 and 0.774, respectively) results.
We report an easy-to-use trauma score with better prognostication ability for in-hospital mortality compared to the RTS and MGAP score. Further studies to test clinical applicability of the novel score are warranted.