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Table 1 Clinical characteristics of cardiac surgical patients with and without a cardiovascular intensive care unit readmission

From: Predicting cardiovascular intensive care unit readmission after cardiac surgery: derivation and validation of the Alberta Provincial Project for Outcomes Assessment in Coronary Heart Disease (APPROACH) cardiovascular intensive care unit clinical prediction model from a registry cohort of 10,799 surgical cases

Characteristic No readmission (n = 10,320) Readmission (n = 479) P value
Demographics    
  Age, mean (SD), years 64.6 (12.7) 68.9 (12.9) <0.001
  Male, % 75.8 71.0 0.17
  BMI, mean (SD), kg/m2 28.9 (5.9) 28.5 (5.5) 0.112
Medical history, %    
  Hypertension 77.5 81.6 0.035
  Dyslipidemia 89.7 88.3 0.315
  Type 1 diabetes 1.0 1.9 0.063
  Type 2 diabetes 29.4 35.9 0.002
  Prior myocardial infarction 45.1 45.5 0.86
  Prior PCI 14.2 13.2 0.537
  Prior CABG 3.0 6.5 <0.001
  Heart failure 15.7 29.0 <0.001
  NYHA class    
  Class I 7.0 4.0 <0.001
  Class II 13.9 12.1  
  Class III 15.6 19.4  
  Class IV 4.3 7.5  
  Not entered 59.1 57.0  
  Cerebrovascular disease 12.5 17.5 0.001
  Current smoker 24.7 23.4 0.525
  Chronic lung disease 32.6 52.4 <0.001
  Chronic liver disease 1.0 3.5 <0.001
  Chronic renal failure 2.2 5.8 <0.001
  Preoperative dialysis 1.4 2.9 0.005
Preoperative investigations    
Extent of coronary artery disease (≥70%), %    0.452
  0 17.9 18.4
  1 or 2 11.9 14.0
  3 38.6 34.9
  Left main 21.9 22.3
  Not available 9.7 10.4
Left ventricular ejection fraction, %    <0.001
  >50% 35.3 23.2
  >35-50% 17.1 14.8
  >20-34% 4.2 7.5
  <20% 1.0 3.3
  Not done due to emergency surgery 15.9 21.3
  Not available 26.5 29.9
Hemoglobin, mean (SD), g/L 136.3 (18.5) 128.0 (20.8) <0.001
Creatinine, mean (SD), μmol/L 100.6 (65.4) 116.4 (81.1) <0.001
  1. BMI: body mass index; CABG: coronary artery bypass graft; NYHA: New York Heart Association; PCI: percutaneous coronary intervention; SD: standard deviation.