Table 5.

Areas under the curve for variation combinations of comorbidity indices and demographic data

	C-statistic	p Value
30-day mortality
Age, race, sex	0.61 (0.60–0.62)	–
Charlson only	0.65 (0.65–0.66)	Reference
Charlson, age, race, sex	0.67 (0.66–0.67)	<0.001
Elixhauser only	0.66 (0.65–0.67)	Reference
Elixhauser, age, race, sex	0.69 (0.68–0.70)	<0.001
90-day mortality
Age, race, sex	0.60 (0.59–0.60)	–
Charlson only	0.69 (0.68–0.70)	Reference
Charlson, age, race, sex	0.69 (0.69–0.70)	<0.001
Elixhauser only	0.71 (0.70–0.71)	Reference
Elixhauser, age, race, sex	0.73 (0.72–0.73)	<0.001
180-day mortality
Age, race, sex	0.59 (0.59–0.60)	–
Charlson only	0.71 (0.70–0.71)	Reference
Charlson, age, race, sex	0.71 (0.71–0.72)	<0.001
Elixhauser only	0.72 (0.71–0.72)	Reference
Elixhauser, age, race, sex	0.73 (0.73–0.74)	<0.001
365-day mortality
Age, race, sex	0.59 (0.58–0.59)	–
Charlson only	0.72 (0.71–0.72)	Reference
Charlson, age, race, sex	0.72 (0.72–0.73)	<0.001
Elixhauser only	0.72 (0.72–0.72)	Reference
Elixhauser, age, race, sex	0.73 (0.73–0.74)	<0.001

p Value for difference comparing the comorbidity index alone to a model with the respective comorbidity index plus age, race and sex included in the model.