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Table 1 Patients baseline characteristics

From: Preoperative anemia increases mortality and postoperative morbidity after cardiac surgery

  Preoperative anemia (n = 1,856) Control group (n = 5,882) P
Age (years ± SD) 69 ± 10.6 64.5 ± 11.6 <0.0001
Hemoglobin level (g/dl ± SD) 11.5 ± 1.1 14.3 ± 1.1 <0.0001
Female, n (%) 517 (27.9) 1419 (24.1) <0.001
NYHA III-IV class, n (%) 809 (43.6) 1826 (31) <0.0001
Diabetes, n (%) 424 (22.8) 703 (12) <0.0001
Diabetes, n (%) 424 (22.8) 703 (12) <0.0001
Hypertension, n (%) 1306 (70.4) 3910 (66.5) 0.002
Chronic Pulmonary disease, n (%) 293 (15.8) 661 (11.2) <0.0001
Renal failure, n (%) 85 (4.6) 42 (0.7) <0.0001
Extracardiac arteriophaty, n (%) 222 (12) 429 (7.3) <0.0001
Previous cardiac operations, n (%) 128 (6.9) 330 (5.6) 0.046
Preoperative EF (%), n (%)    <0.0001
  Good 1296 (69.8) 4579 (77.8)  
  Fair 439 (23.7) 1114 (18.9)  
  Poor 121 (6.5) 189 (3.2)  
Recent MI, n (%) 479 (25.8) 987 (16.8) <0.0001
Emergency, n (%) 78 (4.2) 90 (1.5) <0.0001
Cardiac procedures    <0.0001
CABG, n (%) 1075 (57.9) 3775 (64.2)  
Single valve surgery (n, %) 319 (17.2) 935 (15.9)  
Combined procedures (n, %) 372 (20) 655 (11.1)  
Aortic surgery, n (%) 90 (4.8) 217 (3.7)  
  1. NYHA: New York Heart Association, EF: Ejection fraction; MI: myocardial infarction; CABG: coronary artery bypass grafting.