Table 8. Vascular occlusive events (fatal and non-fatal) by category of predicted risk of death and red blood cell transfusion.
| Predicted Risk of Deatha | Vascular Occlusive Events according to Transfusion Status of Patient | OR (95% CI) | Risk Difference (95% CI) | p-Value | |
| Transfusion | No Transfusion | ||||
| <6% | 50/3,406 (1.5%) | 16/5,300 (0.3%) | 4.92 (2.80 to 8.65) | 1.2% (0.7% to 1.6%) | <0.0001 |
| 6%–20% | 81/3,905 (2.1%) | 37/2,945 (1.3%) | 1.66 (1.13 to 2.46) | 0.8% (0.2% to 1.4%) | 0.009 |
| 21%–50% | 84/1,761 (4.8%) | 27/997 (2.7%) | 1.80 (1.16 to 2.80) | 2.1% (0.6% to 3.5%) | 0.006 |
| >50% | 51/960 (5.3%) | 20/583 (3.4%) | 1.58 (0.93 to 2.68) | 1.9% (−0.2% to 3.9%) | 0.081 |
Interaction between RBC transfusion and predicted risk of death on the OR, p = 0.013.
a
Risk group determined according to model published in [10].