Table 23: Parameter Estimates for Blood Transfusions
| Variable | DF | Parameter Estimate | Standard Error | P-value |
| Intercept | 1 | -2.7118 | 0.5513 | < .0001 |
| S1S2S3 | 1 | 0.3475 | 0.4603 | 0.4503 |
| S1S2 | 1 | -0.0152 | 0.5914 | 0.9796 |
| S2S3* | 1 | 1.2128 | 0.4974 | 0.0147 |
| S1S3 | 1 | 0.3904 | 0.4796 | 0.4157 |
| S3 | 1 | 0.4074 | 0.5640 | 0.4700 |
| A1A2* | 1 | 0.7298 | 0.4164 | 0.0796 |
| A1* | 1 | -0.6755 | 0.3787 | 0.0744 |
| A2 | 1 | 0.2730 | 0.3613 | 0.4499 |
| A3 | 1 | -0.3990 | 0.4035 | 0.3228 |
| TA* | 1 | -1.8792 | 0.3030 | < .0001 |
| Age_Group (0 vs 1)* | 1 | -0.5214 | 0.1075 | < .0001 |
| Gender (F vs M)* | 1 | 0.3901 | 0.1100 | 0.0004 |