We used ordinary least squares stepwise-regression models to associate time spent on nursing education and care management processes in which at least 70% of patients participated, with patient and injury characteristics. The strength of the model is determined by the R2 value, which indicates the amount of variation explained by the significant variables. Type II semi-partial correlation coefficients allow for estimation of the unique contribution of each predictor variable after controlling for all other variables in the model.21,22 The parameter estimates indicate the direction and strength of the association between each independent variable with the dependent variable.