Patient characteristics (n=81)
| Characteristic | Not transfused | Transfused | P value* |
| Age, mean, years (SD) | 26 (6) | 24 (7) | 0.66 |
| Race (%) | |||
| African American | 32.4 | 14.3 | 0.30 |
| Other race | 1.4 | 0.0 | |
| White | 63.5 | 71.4 | |
| Not reported | 2.7 | 14.3 | |
| Mechanism of injury (%) | |||
| Assault | 2.7 | 14.3 | 0.06 |
| Fall | 10.9 | 0.0 | |
| Gunshot wounds | 1.4 | 14.3 | |
| Knife | 1.4 | 0.0 | |
| Moped | 2.7 | 0.0 | |
| Motor vehicle collision | 67.5 | 42.9 | |
| Motorcycle | 1.4 | 0.0 | |
| Not applicable | 0.0 | 14.3 | |
| Other | 4.1 | 0.0 | |
| Pedestrian | 1.4 | 0.0 | |
| Stab, cut, pierce | 4.1 | 0.0 | |
| Not reported | 2.7 | 14.3 | |
| Injury type (%) | |||
| Blunt | 90.5 | 71.4 | 0.09 |
| Inhalation | 1.4 | 0.0 | |
| Penetrating | 8.1 | 14.3 | |
| Not reported | 0.0 | 14.3 | |
| Injury severity score, mean (SD) | 8 (7) | 32 (22) | <0.001 |
| Trimester (%) | |||
| 1 | 25.7 | 28.6 | 0.61 |
| 2 | 40.5 | 57.1 | |
| 3 | 33.8 | 14.3 | |
| Hemoglobin (g/dL) | |||
| Measured at admission, mean (SD) | 11.2 (1.4) | 11.3 (0.5) | 0.78 |
| Change during first 24 hours, mean (SD) | −0.8 (1.0) | −4.3 (1.9) | <0.001 |
| Missing/not obtained (n) | 7 | 0 | |
*Χ2 used to calculate p value for categorical variables and t-test used to calculate p value for continuous variables.