Baseline clinical and radiologic characteristics
| Characteristic | |
|---|---|
| Mean age, years (SD) | 52 (22.5) |
| Sex | |
| Male (%) | 117 (75) |
| Female (%) | 40 (25) |
| Mean admission blood pressure, mm Hg | |
| Systolic (SD) | 140.7 (26.8) |
| Diastolic (SD) | 76.4 (14.8) |
| Mean admission GCS (SD) | 11.58 (4.17) |
| History of hypertension (%) | 46 (29) |
| Mean admission platelet count (SD) | 244 (71) |
| Mean admission INR (SD) | 1.24 (0.53) |
| Mean admission aPTT (SD) | 25.70 (5.33) |
| Altered coagulation (%) | 9 (6) |
| Antiplatelet therapy (%) | 24 (15) |
| Mechanism of injury | |
| Fall from standing (%) | 84 (54) |
| Fall from height (%) | 18 (12) |
| Motor vehicle crash (%) | 24 (15) |
| Pedestrian struck (%) | 16 (10) |
| Direct blunt trauma (%) | 13 (8) |
| Penetrating trauma (%) | 2 (1) |
| aSDH location | |
| Frontal (%) | 99 (50) |
| Temporal (%) | 38 (19) |
| Parietal (%) | 31 (16) |
| Parafalcine (%) | 15 (8) |
| Occipital (%) | 13 (6) |
| Cerebellar (%) | 3 (1) |
| Mean initial maximum aSDH width, mm (SD) | 6.0 (3.5) |
| Mean initial maximum midline shift, mm (SD) | 2.2 (2.9) |
| Mean time to follow-up NCCT, hours (SD) | 11.76 (7.98) |