Baseline characteristics of aneurysms with different aneurysmal wall enhancement grades
| Characteristics | Grade 0 | Grade 1 | Grade 2 | Grade 3 | P value |
| Number of IAs | 12 (24.5%) | 9 (18.4%) | 15 (30.6%) | 13 (26.5%) | 0.213 |
| Age (years) | 57.7±6.0 | 57.4±7.2 | 51.5±13.3 | 48.9±14.8 | 0.243 |
| Sex (female) | 12 (24.5%) | 8 (16.3%) | 9 (18.4%) | 9 (18.4%) | 0.067 |
| Hypertension | 5 (10.2%) | 5 (10.2%) | 9 (18.4%) | 5 (10.2%) | 0.641 |
| Diabetes | 2 (4.1%) | 0 (0%) | 0 (0%) | 0 (0%) | 0.098 |
| Hyperlipidaemia | 4 (8.2%) | 2 (4.1%) | 3 (6.1%) | 1 (2.0%) | 0.476 |
| Smoking history | 1 (2.0%) | 1 (2.0%) | 5 (10.2%) | 3 (6.1%) | 0.378 |
| Size | 10.1±2.7 | 10.2±1.1 | 15.2±8.0 | 21.5±8.9 | 0.001 |
| PHASES score | 7.5±3.4 | 8.6±2.8 | 8.4±2.0 | 8.7±2.6 | 0.634 |
| Location | 0.748 | ||||
| ICA | 4 (8.2%) | 5 (10.2%) | 6 (12.2%) | 6 (12.2%) | |
| AComA | 2 (4.1%) | 0 (0.0%) | 0 (0.0%) | 2 (4.1%) | |
| PComA | 0 (0.0%) | 0 (0.0%) | 1 (2.0%) | 1 (2.0%) | |
| ACA | 0 (0.0%) | 0 (0.0%) | 1 (2.0%) | 0 (0.0%) | |
| MCA | 1 (2.0%) | 1 (2.0%) | 0 (0.0%) | 0 (0.0%) | |
| PC | 4 (8.2%) | 3 (6.1%) | 7 (14.3%) | 4 (8.2%) |
ACA, anterior cerebral artery; AComA, anterior communicating artery; ICA, internal carotid artery; MCA, middle cerebral artery; PC, posterior circulation; PComA, posterior communicating artery; PHASES, Population, Hypertension, Age, Size, Earlier subarachnoid haemorrhage and Site.