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. Author manuscript; available in PMC: 2015 Oct 24.
Published in final edited form as: Med Care. 2011 Oct;49(10):940–947. doi: 10.1097/MLR.0b013e318229360e

Table 3.

Discrimination (c-statistic or area under the ROC curve) of the different scoring systems in the derivation and validation samples.

Regression model 2-year look-back window for identifying comorbidities in administrative data 1-year look-back window for identifying comorbidities in administrative data
Derivation sample Validation sample Derivation sample Validation sample
Mortality Risk Score 0.918 0.917 0.916 0.916
Age + sex + ADG Score 0.914 0.913 0.913 0.913
Age + sex + ADG Score + Age*ADG Score 0.914 0.913 0.913 0.913
Age + sex + ADG Score; Cubic smoothing splines for Age and ADG Score 0.914 0.913 0.914 0.914
Age + sex + Charlson score 0.906 0.906 0.902 0.902
Age + sex + Charlson score + Age*Charlson score 0.907 0.906 0.903 0.902
Age + sex + Charlson score; Cubic smoothing splines for Age 0.908 0.907 0.904 0.903
Age + sex + Elixhauser score 0.908 0.907 0.903 0.903
Age + sex + Elixhauser score + Age* Elixhauser score 0.909 0.908 0.905 0.904
Age + sex + Elixhauser score; Cubic smoothing splines for Age 0.909 0.908 0.905 0.904