Stratification of the severity of critically ill patients with classification trees

Table 5 Results of multiple logistic regression

Variable	Coefficient	SD	*p-value*	OR	95% CI
Age (years)	0.041	0.004	< 0.001	1.041	1.033 - 1.050
HR (ppm)	0.009	0.002	< 0.001	1.009	1.005 - 1.013
Inotropic therapy	0.730	0.137	< 0.001	2.074	1.585 - 2.714
Glasgow	-0.180	0.019	< 0.001	0.835	0.805 - 0.867
MV	0.502	0.145	0.001	1.655	1.245 - 2.201
(A-a)O2 gradient	0.002	0.001	< 0.001	1.002	1.002 - 1.003
Acute renal failure	0.459	0.160	0.002	1.582	1.180 - 2.123
COI	1.026	0.156	< 0.001	2.789	2.054 - 3.788
Trauma	-0.357	0.160	0.026	0.700	0.511 - 0.957
Intercept	-3.351

HR: Heart rate; MV: Mechanical ventilation; (A-a)O2 gradient: Alveolar-arterial oxygen gradient; COI: Chronic organ insufficiency.

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