Figure 1. Receiver operating characteristic curve analysis comparing predictive performance of 7 comorbidity scores. Figures 1A and 1B show results for all scores on and (A) 3-year mortality and (B) 5-year mortality. Figures 1C and 1D demonstrate the effect of the addition of age to 3 "pure" comorbidity scores (ie, initially derived without age as a contributor) on the predictive performance for (C) 3-year mortality, and (D) 5-year mortality.