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Table 4 Coefficients for the main effect variables* in the APACHE IV multivariable regression model that predicts remaining intensive care unit (ICU) stay after day 5.

From: A predictive model for the early identification of patients at risk for a prolonged intensive care unit length of stay

Variable Coefficient p-value
DAY 1   
APS (per 10 units) -0.37470 0.02
AIDS 0.76707 0.30
Cirrhosis -0.69324 0.10
Hepatic Failure -1.00013 0.02
Immunosuppression -0.16578 0.41
Lymphoma -0.79370 0.18
Leukemia or Myeloma -1.22184 0.02
Metastatic Tumor 0.04277 0.89
Admitted from the Floor 0.02120 0.91
Admitted from the Operating/Recovery Room -0.37637 0.63
Admitted from Other Hospital -0.27897 0.27
Length of Stay before ICU Admission (per day) -0.43308 0.22
Age (per 10 years) -0.11960 0.41
(PaO2 : FiO2 )/10 on Day 1 (per 10 units) -0.00285 0.99
Emergency Surgery? -0.37896 0.26
Ventilated on Day 1? -1.59366 <0.01
Unable to Assess Glasgow Coma Score on Day 1? -2.43030 <0.01
Rescaled Glasgow Coma Score on Day 1 -0.09905 <0.01
Day 1 ICU Length of Stay Prediction (per day) 0.84742 <0.01
Readmission to ICU? 0.18283 0.44
DIAGNOSTIC CATEGORIES (non-operative)   
Airway obstruction -0.36374 0.67
Aspiration pneumonia -0.02422 0.96
Bacterial pneumonia -0.60479 0.16
Cardiac arrest -0.01874 0.97
Cardiogenic shock 0.91314 0.19
Congenstive heart failure 0.21795 0.63
Hyperglycemic hyperosmolar-nonketotic coma -0.46909 0.52
COPD (emphysema/bronchitis) -0.11881 0.81
Cardiovascular, other 0.72263 0.14
General, other 0.75895 0.19
GI bleeding, upper -0.42147 0.34
GI, other 0.25619 0.64
Hepatic failure -2.31722 <0.01
Hypovolemia/dehydration (not shock) 0.07455 0.92
Intracerebral hemorrhage 0.97105 0.04
Multiple trauma (excluding head trauma) 0.85690 0.10
Neurologic, other 0.46786 0.42
Drug overdose -0.15812 0.80
Pancreatitis 0.06019 0.94
Pleural effusion 0.71845 0.37
Pulmonary edema (noncardiac, ARDS) -1.15959 0.03
Pulmonary embolism -0.35920 0.62
Renal, other 0.43602 0.49
Respiratory arrest 0.89615 0.07
Respiratory, other 0.47893 0.26
Rhythm disturbance 0.67577 0.26
Subarachnoid hemorrhage, intracranial aneurysm 1.46182 0.01
Subdural/epidural hematoma -0.71143 0.31
Seizure (no structural disease) -0.50347 .50
Sepsis, gastrointestinal -0.25015 0.66
Sepsis, other location -0.36255 0.53
Sepsis, pulmonary -0.06425 0.90
Sepsis, unknown location -0.49536 0.36
Sespsis, urinary tract 0.33721 0.56
Sepsis, cutaneous -0.5287 0.51
Stroke -0.59321 0.27
Head trauma with multiple other injuries -0.55691 0.45
Head trauma only 1.79925 <0.01
DIAGNOSTIC CATEGORIES (post-operative)   
Aortic aneurysm, elective repair 1.06657 0.24
GI malignancy 2.07196 0.04
CABG with single valve surgery 4.09432 <0.01
Craniotomy or transsphenoidal procedure, neoplasm 1.56513 0.14
Cardiovascular surgery, other 3.95827 <0.01
GI obstruction 0.79922 0.42
GI surgery, other 2.59499 <0.01
GI, perforation 1.47170 .12
GI, vascular ischemia 0.96945 0.35
Multiple trauma including the head -0.41853 0.73
Multiple trauma excluding the head 1.88865 0.05
Neurologic surgery, other 2.64227 <0.01
Peripheral ischemia (embolectomy, thrombectomy, dilation) 1.95534 0.07
Respiratory surgery, other 2.24947 0.01
Thoracotomy, malignancy 2.98145 <0.01
Aortic aneurysm, rupture -0.22531 0.84
Subarachnoid hemorrhage (aneurysm, arteriovenous malformation) 2.16347 0.06
Subdural/epidural hemtoma 0.67618 0.54
Head trauma only -0.00303 0.99
Valvular heart surgery 3.21080 <0.01
DAY 5   
APS taken on Day 5 (per 10 units) 0.75210 <0.01
Ventilated on Day 5? 2.22229 <0.01
Unable to Assess Glasgow Coma Score on Day 5? 3.94695 <0.01
(PaO2 : FiO2 )/10 on Day 5 (per 10 units) -0.96110 <0.01
Rescaled Glasgow Coma Score on Day 5 0.19615 <0.01
Delta APS Day 4 - APS Day 5 (per 10 units) 0.11160 <0.01
  1. No selection methodology was used.
  2. *All variables except for the spline terms
  3. APS = Acute physiology score of APACHE III; AIDS = Acquired immunodeficiency syndrome; GI = Gastrointestinal; ARDS = Adult respiratory distress syndrome; CABG; Coronary artery bypass graft;