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Table 1 Univariate association between preoperative characteristics and prolonged intensive care unit stay

From: Preoperative calculation of risk for prolonged intensive care unit stay following coronary artery bypass grafting

  % of Patients Prolonged ICU Stay (%) Odds Ratio (95% CI) P Value
Age (years)
   <70 75.4 7.9 Ref.  
   70 – 74 16.6 12.4 1.6 (1.3 – 2.1) <0.001
   ≥ 75 8.0 14.4 2.0 (1.5 – 2.6) <0.001
    Trend <0.001
Gender
   Male 80.5 9.1 Ref.  
   Female 19.5 9.6 1.1 (0.8 – 1.3) 0.58
Body mass index (kg/m2)
   <30 72.8 8.4 Ref.  
   30 – 34 22.1 10.4 1.3 (1.0 – 1.6) 0.035
   ≥ 30 5.1 15.0 1.9 (1.3 – 2.7) <0.001
    Trend <0.001
Angina class IV
   No 68.1 7.3 Ref.  
   Yes 31.9 13.1 1.9 (1.6 – 2.3) <0.001
NYHA class IV
   No 93.9 8.7 Ref.  
   Yes 6.1 15.5 1.9 (1.4 – 2.6) <0.001
Previous myocardial infarction
   No 53.5 8.0 Ref.  
   Yes 46.5 10.5 1.4 (1.1 – 1.6) 0.001
Recent myocardial infarction
   No 94.7 8.8 Ref.  
   Yes 5.3 14.8 1.8 (1.3 – 2.5) <0.001
Current smoker
   No 84.9 8.5 Ref.  
   Yes 15.1 12.8 1.6 (1.2 – 2.0) <0.001
Hypercholesterolaemia
   No 22.1 8.0 Ref.  
   Yes 77.9 9.5 1.2 (0.9 – 1.5) 0.13
Hypertension
   No 49.0 7.4 Ref.  
   Yes 51.0 10.8 1.5 (1.2 – 1.8) <0.001
Diabetes
   No 83.6 8.2 Ref.  
   Yes 16.4 14.2 1.9 (1.5 – 2.3) <0.001
Renal dysfunction
   No 97.8 8.5 Ref.  
   Yes 2.2 39.8 7.1 (4.8 – 10.5) <0.001
Cerebrovascular disease
   No 91.7 8.8 Ref.  
   Yes 8.3 13.3 1.6 (1.2 – 2.1) 0.002
Peripheral vascular disease
   No 87.2 8.2 Ref.  
   Yes 12.8 15.9 2.1 (1.7 – 2.7) <0.001
Respiratory disease
   No 69.2 8.2 Ref.  
   Yes 30.8 11.3 1.4 (1.2 – 1.7) <0.001
Previous gastric ulcer
   No 88.4 9.0 Ref.  
   Yes 11.6 10.3 1.2 (0.9 – 1.5) 0.28
Previous GI surgery
   No 88.3 8.9 Ref.  
   Yes 11.7 11.2 1.3 (1.0 – 1.7) 0.061
Previous PCI
   No 94.1 9.2 Ref.  
   Yes 5.9 9.2 1.0 (0.7 – 1.5) 0.97
Ejection fraction <30%
   No 91.0 8.2 Ref.  
   Yes 9.0 18.7 2.6 (2.0 – 3.3) <0.001
Triple-vessel disease
   No 18.2 6.5 Ref.  
   Yes 81.8 9.7 1.6 (1.2 – 2.1) 0.002
Left main stenosis >50%
   No 81.9 9.2 Ref.  
   Yes 18.1 9.2 1.0 (0.8 – 1.3) >0.99
Prior Heart surgery
   No 97.3 9.1 Ref.  
   Yes 2.7 12.9 1.5 (0.9 – 2.4) 0.12
Emergency procedure
   No 97.9 8.8 Ref.  
   Yes 2.1 24.6 3.4 (2.1 – 5.2) <0.001
  1. ICU, Intensive Care Unit; CI, Confidence Intervals; NYHA, New York Heart Association; GI, Gastro-intestinal; PCI, Percutaneous Coronary Interventions.