Table 1.
Descriptive data for baseline stratified to wall enhancement
| Wall enhancement at baseline | ||||
| Patient characteristics | All (N = 455) | N, missing | Present (N = 168) | Absent (N = 287) |
| Female sex | 323 (71%) | 0 | 127 (76%) | 196 (68%) |
| Mean age, years (SD) | 60 (13) | 0 | 63 (12) | 59 (13) |
| Japanese | 99 (22%) | 0 | 29 (17%) | 70 (24%) |
| Previous SAH from another aneurysm | 48 (11%) | 8 | 11 (7%) | 37 (13%) |
| Hypertension | 201 (44%) | 4 | 78 (46%) | 123 (43%) |
| Current smoker | 110 (24%) | 6 | 36 (21%) | 74 (26%) |
| Family history of SAH | 26 (6%) | 8 | 9 (5%) | 17 (6%) |
| Aneurysm characteristics | All (N = 559) | N, missing | Present (N = 194) | Absent (N = 365) |
| Site | ||||
| ICA | 174 (31%) | 0 | 46 (24%) | 128 (35%) |
| MCA | 209 (37%) | 0 | 81 (42%) | 128 (35%) |
| Acom | 76 (14%) | 0 | 28 (14%) | 48 (13%) |
| Pcom | 33 (6%) | 0 | 11 (6%) | 22 (6%) |
| Vertebrobasilar arteries (excluding basilar tip) | 28 (5%) | 0 | 11 (6%) | 17 (5%) |
| ACA | 24 (4%) | 0 | 11 (6%) | 13 (4%) |
| Basilar tip | 15 (3%) | 0 | 6 (3%) | 9 (3%) |
| Median size, mm (IQR) | 4 (3–6) | 0 | 6 (4–7) | 4 (3–4) |
| Irregular shape | 145 (26%) | 0 | 78 (40%) | 67 (18%) |
| Field strength | ||||
| 1.5T | 115 (21%) | 0 | 32 (16%) | 83 (23%) |
| 3T | 443 (79%) | 0 | 161 (83%) | 282 (77%) |
| 7T | 1 (0%) | 0 | 1 (1%) | 0 (0%) |
| Median follow-up duration, years (IQR) | 1.2 (0.6–2.4) | 0 | 1.1 (0.5–2.2) | 1.3 (0.7–2.5) |
Abbreviations: SD standard deviation, SAH subarachnoid haemorrhage, ICA internal carotid artery, MCA middle cerebral artery, Pcom posterior communicating artery, Acom anterior communicating artery, IQR interquartile range