Administrative and Claims Data Help Predict Patient Mortality in Intensive Care Units by Logistic Regression: A Nationwide Database Study

Table 6

The predictive ability of the ECI combined with selected variables according to the C-statistic.

Score/measure	Inhospital mortality	30-day mortality	1-year mortality
Mortality (number, %)	(259, 16.11%)	(337, 20.96%)	(518, 32.21%)
APACHE II (C-statistic, 95% CI)	0.79 (0.77–0.82)	0.80 (0.78–0.82)	0.76 (0.74–0.79)
ECI
Alone	0.55 (0.52–0.59)	0.57 (0.54–0.61)	0.62 (0.59–0.65)
+Age, sex	0.65 (0.62–0.69)	0.66 (0.63–0.70)	0.70 (0.67–0.72)
+Age, sex, MV (ECI: MODEL 2)	0.76 (0.73–0.79)	0.76 (0.73–0.79)	0.74 (0.71–0.76)
+Age, sex, MV, OP	0.77 (0.74–0.80)	0.77 (0.75–0.80)	0.75 (0.73–0.78)
+Age, sex, MV, OP, outvisits	0.77 (0.74–0.80)	0.78 (0.76–0.81)	0.78 (0.76–0.80)
+Age, sex, MV, OP, outvisits, dept	0.77 (0.74–0.80)	0.78 (0.76–0.81)	0.78 (0.76–0.81)
+Age, sex, MV, OP, outvisits, dept, H/D	0.77 (0.74–0.80)	0.78 (0.76–0.81)	0.78 (0.76–0.81)
+Age, sex, MV, OP, outvisits, dept, H/D, invisits (ECI: MODEL 1)	0.78 (0.75–0.80)	0.79 (0.76–0.81)	0.78 (0.76–0.81)

Abbreviations: APACHE II: Acute Physiology and Chronic Health Evaluation II; ECI: Elixhauser Comorbidity Index; MV: mechanical ventilation; OP: operation; outvisits: number of outpatient visits; dept: department; H/D: hemodialysis; invisits: number of inpatient visit. The ECI combined with age, sex, and MV was named as ECI: MODEL 2. The ECI combined with age, sex, MV, OP, outvisits, dept, H/D, and invisits was named as ECI: MODEL 1.