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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.