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Table 4 Predicting factors for delirium

From: Predisposing factors for delirium in the surgical intensive care unit

% of total   Odds 95% confidence
Factor patients (n = 818)   ratio* interval*
Disease or symptom variables
   Respiratory disease 14.1 30.6 9.5–98.4
   Infection 14.1 18.0 3.5–90.8
   Fever 26.7 14.3 4.1–49.3
   Hypotension 17 19.8 5.3–74.3
   Anemia 16.4 5.4 1.6–17.8
Laboratory variables
   Hypocalcemia 7.7 30.9 5.8–163.2
   Hyponatremia 11.7 8.2 2.5–26.4
   Elevated level of 10.8 4.6 1.4–15.6
serum urea nitrogen    
   Elevated level of 7.3 6.3 1.2–32.2
hepatic enzymes    
   Hyperamylasemia 2 43.4 4.2–442.7
   Hyperbilirubinemia 5.5 8.7 2.0–37.7
   Metabolic acidosis 7.6 4.5 1.1–17.7
  1. * Forward stepwise (conditional) logistic regression.