Baseline prognostic factors of patients with mild TBI categorized by brain CT scan results
| Characteristics | CT positive (n=461) | CT negative (n=538) | P value | ||
| Age (mean±SD) | 46.3±24.1 | 54.9±25.0 | <0.001 | ||
| Admission systolic blood pressure (mean±SD) | 125.3±34.8 | 110.1±28.8 | 0.225 | ||
| ED triage level | |||||
| Level 1 | 14 | 3.1% | 9 | 1.7% | 0.416 |
| Level 2 | 247 | 54.3% | 211 | 39.5% | |
| Level 3 | 186 | 40.9% | 296 | 55.4% | |
| Level 4 | 7 | 1.5% | 17 | 3.2% | |
| Level 5 | 1 | 0.2% | 1 | 0.2% | |
| Type of injury | |||||
| Motorcycle crash | 237 | 51.4% | 137 | 25.5% | <0.001 |
| Motor vehicle crash | 31 | 6.7% | 23 | 4.3% | 0.094 |
| Falling | 108 | 23.4% | 286 | 53.2% | <0.001 |
| Blunt object | 24 | 5.2% | 26 | 4.8% | 0.884 |
| Assault | 38 | 8.2% | 16 | 3.0% | <0.001 |
| Fainting/syncope | 28 | 6.1% | 43 | 8.0% | 0.267 |
| Laboratory results* | |||||
| Platelet (×103) | 222.6 | 836.8 | 243.2 | 119.2 | 0.088 |
| INR | 1.1 | 0.3 | 1.1 | 0.1 | 0.785 |
| Type of TBI | |||||
| EDH | 105 | 22.8% | |||
| SDH | 91 | 19.7% | |||
| SAH | 88 | 19.1% | |||
| Brain contusion | 72 | 15.6% | |||
| IPH | 105 | 23.0% | |||
| Hospital stay (days) | 4.5±6.9 | 2.7±3.1 | <0.001 | ||
| Disposition | |||||
| Discharge | 446 | 96.8% | 536 | 99.6% | <0.001 |
| Dead | 15 | 3.3% | 2 | 0.4% | |
*Laboratory results: platelet concentration and INR reported as mean and SD.
ED, emergency department; EDH, epidural hematoma; INR, international normalized ratio; IPH, intraparenchymal hemorrhage; SAH, subarachnoid hemorrhage; SDH, subdural hematoma; TBI, traumatic brain injury.