TABLE 2.
Radiological characteristics.
| Variable | Training cohort (n = 68) |
Validation cohort (n = 61) |
||||
| Expander (n = 21) | Non-expander (n = 47) | p-value | Expander (n = 19) | Non-expander (n = 42) | p-value | |
| Observer 1 | ||||||
| Location* | ||||||
| Basal ganglia | 16 (76.2) | 35 (74.5) | 0.88 | 11 (57.9) | 31 (73.8) | 0.21 |
| Lobar | 4 (19.1) | 9 (19.2) | 0.99 | 5 (26.3) | 7 (16.7) | 0.38 |
| Thalamus or brainstem | 1 (4.8) | 3 (6.4) | 0.79 | 3 (15.8) | 4 (9.5) | 0.67 |
| Satellite sign number | 2.4 ± 1.6 | 1.0 ± 1.5 | <0.001 | 2.4 ± 1.7 | 0.7 ± 1.0 | 0.001 |
| Black hole sign* | 8 (38.1) | 9 (19.1) | 0.10 | 7 (36.8) | 7 (16.7) | 0.08 |
| Swirl sign* | 7 (33.3) | 6 (12.8) | 0.04 | 8 (42.1) | 9 (21.4) | 0.09 |
| Blend sign* | 9 (42.9) | 10 (21.3) | 0.07 | 7 (36.8) | 9 (21.4) | 0.21 |
| Observer 2 | ||||||
| Location* | ||||||
| Basal ganglia | 16 (76.2) | 36 (76.6) | 0.97 | 11 (57.9) | 31 (73.8) | 0.21 |
| Lobar | 4 (19.1) | 8 (17.0) | 0.84 | 5 (26.3) | 6 (14.3) | 0.23 |
| Thalamus or brainstem | 1 (4.8) | 3 (6.4) | 0.79 | 3 (15.8) | 5 (11.9) | 0.69 |
| Satellite sign number | 2.5 ± 1.7 | 1.1 ± 1.4 | 0.001 | 2.2 ± 1.1 | 0.7 ± 0.6 | 0.003 |
| Black hole sign* | 8 (38.1) | 8 (17.0) | 0.06 | 9 (47.4) | 10 (23.8) | 0.07 |
| Swirl sign* | 7 (33.3) | 7 (14.9) | 0.08 | 8 (42.1) | 10 (23.8) | 0.15 |
| Blend sign* | 7 (33.3) | 8 (17.0) | 0.13 | 7 (36.8) | 8 (19.0) | 0.14 |
Data are means ± standard deviations. ∗Data are the number of patients, with percentages in parentheses.