Patientcharacteristics grouped by training and testing datasets
| Variable name (and type) | Training dataset | Testing dataset | P value* |
| Sample size (n) | 189 | 77 | |
| Age, years, mean±SD | 62.2±13.4 | 63.3±12.0 | 0.521 |
| Sex, male, n (%) | 132 (69.8) | 54 (70.1) | 0.963 |
| Hypertension, n (%) | 140 (74.9) | 62 (80.5) | 0.325 |
| Diabetes mellitus, n (%) | 19 (10.2) | 17 (22.1) | 0.010 |
| Prestroke, n (%) | 13 (6.9) | 11 (14.3) | 0.056 |
| Antiplatelet history, n (%) | 13 (6.9) | 7 (9.1) | 0.535 |
| Anticoagulation history, n | 2† | 0 | N/A |
| Time to baseline CT, hours, mean±SD | 3.4±2.0 | 3.9±2.2 | 0.096 |
| Baseline NIHSS score, median (IQR) | 9 (5–12) | 8 (4–14) | 0.718 |
| Baseline haematoma volume, mL, mean±SD | 17.4±15.3 | 17.8±18.8 | 0.850 |
| Intraventricular haemorrhage, n (%) | 70 (37.0) | 31 (40.3) | 0.623 |
| NCCT markers | |||
| Hypodensities | 132 (69.8) | 44 (57.1) | 0.047 |
| Black hole sign | 28 (14.8) | 12 (15.6) | 0.873 |
| Swirl sign | 116 (61.4) | 44 (57.1) | 0.523 |
| Blend sign | 24 (12.7) | 13 (16.9) | 0.371 |
| Fluid level | 13 (6.9) | 9 (11.7) | 0.196 |
| Irregular shape | 143 (75.7) | 50 (64.9) | 0.075 |
| Heterogeneous density | 100 (52.9) | 34 (44.2) | 0.195 |
| BAT score, median (IQR) | 2 (2–4) | 2 (0–3) | 0.065 |
| Haematoma expansion, n (%) | 52 (27.5) | 22 (28.6) | 0.861 |
*Continuous variables were compared using Mann-Whitney U test and Student’s t-test as appropriate and categorical variables were compared using Pearson’s χ2 test.
†Two patients with warfarin history for atrial fibrillation had no haematoma expansion.
NCCT, non-contrast CT; NIHSS, National Institute of Health Stroke Scale.