| Medical history | Case | Control | P value |
| Diabetes mellitus | 13 (31.7) | 8 (22.9) | 0.71 |
| Hypertension | 12 (29.3) | 12 (34.3) | |
| Myocardial infarction | 16 (39.0) | 15 (42.9) | |
| Total | 41 (100.0) | 35 (100.0) | |
| Duration of admission in intensive care unit |
|
|
|
| 3 days | 12 (29.3) | 13 (37.1) | 0.46 |
| 3 - 7 days | 27 (65.9) | 17 (48.6) | |
| >7 days | 2 (4.9) | 5 (14.3) | |
| Total | 41 (100.0) | 35 (100.0) | |
| Number of grafts |
|
|
|
| One | 13 (31.7) | 8 (22.9) | 0.31 |
| Two | 13 (31.7) | 10 (28.6) | |
| Three | 9 (22.0) | 12 (34.3) | |
| >3 grafts | 6 (14.6) | 5 (14.3)) | |
| Total | 41 (100.0) | 35 (100.0) | |
| Duration after admission to hospital |
|
| |
| 3 days | 7 (17.1) | 9 (25.7) | 0.28 |
| 3 - 7 days | 31 (75.6) | 20 (57.1) | |
| >7 days | 3 (7.3) | 6 (17.1) | |
| Total | 41 (100.0) | 35 (100.0) |