Table 2.

Multivariable logistic regression modeling of risk factors for inhospital death among patients admitted to intensive care units in the Calgary Health Region, Alberta, Canada

Variable	Odds ratio	95% Confidence intervala
APACHE II score = 25	3.06	2.68–3.50
TISS score = 45	2.02	1.75–2.34
Age = 65 years	1.95	1.73–2.20
Hypothermia < 35°C	1.99	1.71–2.32
Shock	1.66	1.46–1.88
Calgary Health Region resident	1.36	1.20–1.55
Noncardiac surgeryb	0.57	0.50–0.64
Cardiac surgeryb	0.02	0.02–0.03

APACHE, Acute Physiology and Chronic Health Evaluation; TISS, Therapeutic Intervention Scoring System.

^aP < 0.0001 for all variables.

^bAs compared with medical diagnosis as the reference group.