Table 2.
Demographics, admission and injury characteristics
| Blood Group | |||
|---|---|---|---|
| O (n=432) | Non-O (n=517) | p-value | |
| Age, mean (SD) | 64.5 (21.3) | 63.6 (20.7) | 0.52 |
| Male, n (%) | 237 (55) | 314 (61) | 0.07 |
| White Race, n (%) | 361 (84.5) | 428 (83.6) | 0.69 |
| Comorbidities, median (IQR) | 1 (2, 7) | 1 (2, 7) | 0.99 |
| Mechanism of injury | |||
| Fall, n (%) | 357 (83) | 418 (81) | 0.48 |
| Injury Severity Score, mean (SD) | 17.0 (5.2) | 16.9 (5.3) | 0.74 |
| Head Abbreviated Injury Scale (missing 2), n (%) | |||
| <3 or 9 | 3 (1) | 2 (<1) | 0.83 |
| 3 | 105 (24) | 134 (26) | |
| 4 | 262 (61) | 305 (59) | |
| 5 | 60 (14) | 76 (15) | |
| Coagulation parameters | |||
| Platelets (k/uL), mean (SD) | 205.2 (92.6) | 207.8 (97.3) | 0.68 |
| INR, mean (SD) | 1.2 (0.5) | 1.3 (0.7) | 0.22 |
| PTT (seconds), mean (SD) | 28.1 (4.7) | 27.4 (5.2) | 0.03 |
| Hg (g/dL), mean (SD) | 13.0 (2.0) | 12.8 (2.1) | 0.08 |
| Vital signs on ED arrival | |||
| Hypotension, SBP <90 mmHg, n (%) (missing 31) | 4 (1) | 11 (2) | 0.14 |
| DBP mmHg, mean (SD) | 81 (17) | 81 (17) | 0.67 |
| MAP mmHg, mean (SD) | 99.7 (21.3) | 99.2 (22.6) | 0.693 |
| Heart Rate >100 bpm, n (%) (missing 25) | 78 (18.5) | 79 (15.7) | 0.27 |
| Admission GCS <15, n (%) (missing 36) | 127 (31) | 151 (30) | 0.93 |
| Patients transfused with blood products, n (%) | |||
| FFP | 48 (11) | 72 (14) | 0.19 |
| PLT | 84 (19) | 126 (24) | 0.07 |
| PRBC | 13 (3) | 29 (6) | 0.05 |
| AFVII | 3 (1) | 10 (2) | 0.10 |
SD standard deviation; IQR, interquartile range; INR, International Normalized Ratio; PTT, partial thromboplastin time; Hg, hemoglobin; ED, emergency department; SBP, systolic blood pressure; DBP, diastolic blood pressure; MAP, mean arterial pressure; GCS, Glasgow Coma Scale; FFP, fresh frozen plasma; PLT, platelets; PRBC, packed red blood cells; AFVII, activated factor seven.