From: Hospital variation in transfusion and infection after cardiac surgery: a cohort study
 |  | Allogeneic transfusion |  |  | |
---|---|---|---|---|---|
 |  | Yes | No | Total |  |
Patient characteristics | Â | 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%) | Â |
 | 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%) | Â |
 | Women | 8,267 (94%) | 562 (6%) | 8,829 (100%) | < 0.001 |
Race: | White | 19,035 (83%) | 3,804 (17%) | 22,839 (100%) | Â |
 | 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%) | Â |
 | 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%) | Â |
 | ≥ 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%) | Â |
 | ≥ 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 |