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Table 2 G2 statistics indicating the contribution of the comorbidity measures to the nested baseline model

From: Comparison of different comorbidity measures for use with administrative data in predicting short- and long-term mortality

  G2†(df‡)
  In-hospital mortality One-year mortality
  AMI COPD AMI COPD
Baseline model* N/A(4) N/A (4) N/A (4) N/A (4)
Index hospitalization only     
   Baseline model + Charlson/Deyo 35 (16) 59 (17) 120 (16) 254 (17)
   Baseline model + Charlson/Romano 100 (15) 114 (16) 280 (15) 613 (16)
   Baseline model + Elixhauser 216 (33) 269 (33) 394 (33) 856 (33)
Index and prior hospitalizations     
   Baseline model + Charlson/Deyo 80 (19) 98 (20) 336 (19) 1106 (20)
   Baseline model + Charlson/Romano 129 (19) 144 (20) 428 (19) 1199 (20)
   Baseline model + Elixhauser 194 (33) 200 (33) 496 (33) 1290 (33)
  1. AMI = acute myocardial infarction; COPD = chronic obstructive pulmonary disease.
  2. * Variables in the baseline model included age, sex, race, and whether the patient received surgery.
  3. † All p values of the G2 statistics, < 0.0001.
  4. ‡ Degree of freedom equals to the number of parameters entered in the regression model. Some comorbidity variables were dropped in the analysis because they had 0% or 100% prevalence.
  5. N/A: Not applicable.
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