Exhibit 1. c-Statistics for Comorbidity Models.
| Model Specification | C-Statistic | (95% CI) |
|---|---|---|
| Beneficiaries with an Inpatient Stay (N = 189,654 Deaths = 28,185) | ||
| Age, Race, Sex | 0.643 | (0.641– 0.645) |
| + Charlson Indicators | 0.741 | (0.739–0.743) |
| + Charlson Score | 0.731 | (0.729–0.733) |
| All Beneficiaries (N = 1,083,781 Deaths = 64,219) | ||
| Age, Race, Sex | 0.715 | (0.714– 0.716) |
| + Indicator for Any Inpatient Stay | 0.767 | (0.766–0.768) |
| + Charlson Indicators (inpatient + outpatient claims) | 0.804 | (0.803–0.805) |
| + Charlson Score (inpatient + outpatient claims) | 0.800 | (0.799–0.801) |
| + Charlson Indicators (inpatient claims only) | 0.746 | (0.745–0.747) |
| + Charlson Score (inpatient claims onlyl) | 0.779 | (0.778–0.780) |
| + Charlson Indicators (inpatient + outpatient claims) | 0.800 | (0.799–0.801) |
| + Charlson Score (inpatient + outpatient claims) | 0.796 | (0.795–0.797) |
| + Charlson Expenditures | 0.749 | (0.748–0.750) |
SOURCE: Medicare Claims and Enrollment Files, 2007–2008. All of our analyses use 2007 data to predict death in 2008.