Table 5. Mortality by category of predicted risk of death and red blood cell transfusion adjusted for propensity score.
| Predicted Risk of Deatha | Deaths according to Transfusion Status of Patient | OR (95% CI) | Risk Difference (95% CI) | p-Value | |
| Transfusion | No Transfusion | ||||
| <6% | 203/3,128 (6.5%) | 61/4,633 (1.3%) | 4.87 (3.62 to 6.55) | 5.0% (4.0% to 5.9%) | <0.0001 |
| 6%–20% | 558/3,758 (14.8%) | 205/2,874 (7.1%) | 2.22 (1.86 to 2.63) | 7.5% (6.0% to 9.0%) | <0.0001 |
| 21%–50% | 462/1,450 (31.9%) | 288/909 (31.7%) | 1.08 (0.90 to 1.30) | 1.8% (−2.2% to 5.7%) | 0.42 |
| >50% | 394/644 (61.2%) | 314/449 (69.9%) | 0.69 (0.53 to 0.90) | −8.3% (−14.1% to −2.5%) | 0.006 |
Interaction between RBC transfusion and predicted risk of death on the OR, p<0.0001 (chi-square = 151).
a
Risk group determined according to model published in [10].