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. Author manuscript; available in PMC: 2016 Sep 1.
Published in final edited form as: Med Care. 2015 Sep;53(9):e65–e72. doi: 10.1097/MLR.0b013e318297429c

Table 2.

Performance of summary measures versus indicator variables using SEER-Medicare data. The base model included age at diagnosis, year of diagnosis, diameter of the tumor, sex, race/ethnicity (five categories: Hispanic or non-Hispanic black, white, Asian, other), and marital status (married/not married).

Model C-Statistic
Base Model Only 0.615
Base Model + Individual Charlson Indicator Variables 0.667
Base Model + Charlson Score 0.664
Base Model + Individual Elixhauser Indicator Variables 0.672
Base Model + Elixhauser Score 0.652