Formula for PRE-DELIRIC model
ˇ Risk of delirium = 1/(1+exp?(?6.31
ˇ + 0.04 × age
ˇ + 0.06 × APACHE-II score
ˇ + 0 for non-coma or 0.55 for drug induced coma or 2.70 for miscellaneous coma or 2.84 for combination coma
ˇ + 0 for surgical patients or 0.31 for medical patients or 1.13 for trauma patients or 1.38 for neurology/neurosurgical patients
ˇ + 1.05 for infection
ˇ + 0.29 for metabolic acidosis
ˇ + 0 for no morphine use or 0.41 for 0.01-7.1 mg/24 h morphine use or 0.13 for 7.2-18.6 mg/24 h morphine use or 0.51 for >18.6 mg/24 h morphine use
ˇ + 1.39 for use of sedatives
ˇ + 0.03 × urea concentration (mmol/L)
ˇ + 0.40 for urgent admission))
ˇ The scoring system’s intercept is expressed as ?6.31; the other numbers represent the shrunken regression coefficients (weight) of each risk factor.