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Table 3 Change in c-statistics upon exclusion of claims occurring on the index admission date.a

From: Comparison of the performance of the CMS Hierarchical Condition Category (CMS-HCC) risk adjuster with the charlson and elixhauser comorbidity measures in predicting mortality

   Summary score Indicators
Outcome Sample CMS-HCC Charlson Elixhauser CMS-HCC Charlson Elixhauser
In-hospital All patientsb -0.133** -0.017** -0.027** -0.196** -0.021** -0.06**
  (N = 170,342) (-0.139,-0.127) (-0.019,-0.014) (-0.03, -0.024) (-0.203, -0.189) (-0.025, -0.017) (-0.065, -0.054)
  DM -0.082** 0.016 -0.010 NA NA NA
  (N = 2,339) (-0.113, -0.035) (-0.023, 0.029) (-0.045, 0.008)    
  Stroke -0.128** -0.001 -0.013** NA -0.008 -0.042
  (N = 9,828) (-0.147, -0.1) (-0.006, 0.002) (-0.02, -0.005)   (-0.017, 0.001) (-0.055, -0.02)
  AMI -0.081** -0.001 -0.011** NA 0.001 -0.038
  (N = 5,749) (-0.095, -0.063) (-0.005, 0.003) (-0.017, -0.005)   (-0.009, 0.009) (-0.053, -0.018)
  CHF -0.054** -0.004 -0.011** -0.086** -0.001 -0.024**
  (N = 11,287) (-0.066, -0.041) (-0.011, 0.002) (-0.018, -0.002) (-0.096, -0.06) (-0.012, 0.007) (-0.035, -0.009)
Six-month All patientsb -0.058** -0.024** -0.023** -0.074** -0.028** -0.038**
  (N = 170,342) (-0.06, -0.056) (-0.026, -0.022) (-0.025, -0.022) (-0.076, -0.071) (-0.03, -0.026) (-0.04,-0.036)
  DM -0.030** -0.022** -0.017** -0.029** NA -0.025**
  (N = 2,339) (-0.038, -0.018) (-0.031, -0.008) (-0.024, -0.008) (-0.044, -0.012)   (-0.038, -0.007)
  Stroke -0.064** -0.004** -0.014** -0.112** -0.006** -0.030**
  (N = 9,828) (-0.07, -0.053) (-0.006, -0.001) (-0.017, -0.01) (-0.119, -0.096) (-0.01, -0.002) (-0.035, -0.022)
  AMI -0.050** -0.006** -0.015** -0.072** -0.008** -0.031**
  (N = 5,749) (-0.057, -0.041) (-0.009, -0.002) (-0.02, -0.01) (-0.08, -0.056) (-0.012, -0.003) (-0.038, -0.022)
  CHF -0.016** -0.003 -0.007** -0.023** -0.004 -0.014**
  (N = 11,287) (-0.02, -0.012) (-0.005, 0) (-0.01, -0.003) (-0.026, -0.016) (-0.007, 0) (-0.017, -0.007)
  1. Note: **: The c-statistic of the model "IP+OPpre12mo+index" (included all inpatient and outpatient claims in the 12 months prior to the index hospitalization including the index admission date) is statistically significant different from the model "IP+OPpre12mo " (included all inpatient and outpatient claims in the 12 months prior to the index hospitalization excluding the index admission date) at the 5% level;
  2. NA: Models did not converge due to complete (or quasi-complete) separation.
  3. a Change in c-statistics upon exclusion of claims occurring on the index admission date was estimated by comparing c-statistic of the model "IP+OPpre12mo+index" (included all inpatient and outpatient claims in the 12 months prior to the index hospitalization including the index admission date) and the c-statistic of the model "IP+OPpre12mo " (included all inpatient and outpatient claims in the 12 months prior to the index hospitalization excluding the index admission date); 95% confidence intervals of measures are in parentheses.
  4. b Patients with any hospital admission between January 1st, 2006 and June 30th, 2006.