Table 7.

Elixhauser and Charlson comorbidity method discrimination for inpatient outcomes after orthopaedic surgery

Model	Mortality		Adverse events		Nonroutine discharge
	AUC (95% CI)	R-square	AUC (95% CI)	R-square	AUC (95% CI)	R-square
Base model (age, sex, year of surgery)	0.81 (0.81–0.81)	0.12	0.64 (0.63–0.64)	0.066	0.81 (0.81–.81)	0.35
Base model + Charlson score	0.83 (0.83–0.84)	0.14	0.64 (0.64–0.64)	0.067	0.81 (0.81–0.82)	0.36
Base model + Elixhauser score	0.86 (0.86–0.86)	0.18	0.65 (0.65–0.65)	0.077	0.81 (0.81–0.82)	0.36

AUC = area under the receiver operating characteristic curve.