A subgroup analysis of patients with NISSs greater than 15 was performed to examine complications, mortality, overall injury severity, and triage destination. Descriptive statistics, χ 2 analysis, independent-samples t tests, and univariate and multivariate logistic regression analyses were performed using IBM SPSS, version 25 ( IBM Corporation, 2017 ). Two regression models were developed to identify predictors of complications and to determine the association of complications with mortality. Univariate logistic regression was performed to determine which plausible variables should be included in the multivariate logistic regression models. An α value of .1 or less was used for identifying variables for the regression model. The level of significance for all other analyses was α value of less than .05. Predictor variables for the multivariate logistic regression analyses were entered into the model using backward stepwise likelihood ratio method. Model fit was determined by the Hosmer–Lemeshow test.