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Table 1 Characteristics of patients who underwent coronary artery bypass graft surgery

From: Hospital variation in transfusion and infection after cardiac surgery: a cohort study

   Allogeneic transfusion   
   Yes No Total  
Patient characteristics   n = 20,789 n = 4,000 n = 24,789 P value
Age (years): 65 to 69 5,069 (77%) 1,487 (23%) 6,556 (100%)  
  70 to 74 5,488 (82%) 1,238 (18%) 6,726 (100%)  
  75 to 79 5,761 (87%) 876 (13%) 6,637 (100%)  
  80 to 84 3,513 (91%) 350 (9%) 3,863 (100%)  
  ≥ 85 958 (95%) 49 (5%) 1,007 (100%) < 0.001
Gender: Men 12,522 (78%) 3,438 (22%) 15,960 (100%)  
  Women 8,267 (94%) 562 (6%) 8,829 (100%) < 0.001
Race: White 19,035 (83%) 3,804 (17%) 22,839 (100%)  
  Black 1,250 (90%) 133 (10%) 1,383 (100%)  
  Other 504 (89%) 63 (11%) 567 (100%) < 0.001
Type of admission: Elective 9,183 (80%) 2,289 (20%) 11,472 (100%)  
  Urgent 6,035 (85%) 1,083 (15%) 7,118 (100%)  
  Emergency 5,571 (90%) 628 (10%) 6,199 (100%) < 0.001
Hospital CABG volume (annual mean): < 240 10,988 (87%) 1,595 (13%) 12,583 (100%)  
  ≥ 240 9,801 (80%) 2,405 (20%) 12,206 (100%) < 0.001
Surgeon CABG volume (annual mean): < 60 10,796 (87%) 1,605 (13%) 12,401 (100%)  
  ≥ 60 9,993 (81%) 2,395 (19%) 12,388 (100%) < 0.001
Coexisting conditions: Diabetes mellitus 5,747 (82%) 1,227 (18%) 6,974 (100%) < 0.001
  Renal failure 2,006 (93%) 152 (7%) 2,158 (100%) < 0.001
  Myocardial infarction 7,207 (86%) 1,157 (14%) 8,364 (100%) < 0.001
  Congestive heart failure 6,593 (93%) 529 (7%) 7,122 (100%) < 0.001
  Hypertension 11,063 (80%) 2,851 (20%) 13,914 (100%) < 0.001
  Peripheral vascular disease 2,491 (84%) 474 (16%) 2,965 (100%) 0.813
  Cerebrovascular disease 1,586 (86%) 265 (14%) 1,851 (100%) 0.027
  Chronic pulmonary disease 5,014 (86%) 830 (14%) 5,844 (100%) < 0.001
  Malignancy 463 (84%) 85 (16%) 548 (100%) 0.687
  1. CABG = coronary artery bypass graft.