Univariate associations between patient and disease characteristics and perioperative transfusion during Phase II
| Variable | Not transfused(n=201) | Transfused (n=102) | p Value |
| Age (years)* | 66 | 74 | <0.001 |
| Body mass index ≥27.3 | 54 | 46 | 0.21 |
| Female (%) | 15 | 53 | <0.001 |
| Diabetes (%) | 30 | 35 | 0.34 |
| Vascular disease (%) | 22 | 25 | 0.48 |
| Ejection fraction <40% (%) | 11 | 16 | 0.24 |
| Priority (%) | |||
| Elective | 64 | 49 | |
| Urgent | 36 | 51 | |
| Type of surgery (%) | |||
| Coronary artery bypass graft | 44 | 40 | |
| Valve | 37 | 33 | |
| Coronary artery bypass graft/valve | 19 | 26 | 0.32 |
| Pre bypass haematocrit* | 41 | 36 | <0.001 |
| Predicted low haematocrit* | 26 | 22 | <0.001 |
| Cardiopulmonary bypass duration* | 108 | 116 | 0.02 |
↵* Median.