Table 3.
Aneurysm-specific preoperative parameters, with p-values for comparing the external set to the internal set; MCA = middle cerebral artery, ACA = anterior cerebral artery, AComA = anterior communicating artery, PComA = posterior communicating artery, PCA = posterior cerebral artery, AChA = anterior choroidal artery, mRS = modified Rankin Scale, pnND = permanent new neurological deficit, GOS = Glasgow outcome scale, tnND = transient new neurological deficit, mRS-Diff > 1 = mRS difference > 1 (preoperative vs. postoperative).
| Aneurysm-specific preoperative parameters | Internal Set | mRS > 2 | pnND | GOS < 5 | tnND | mRS-Diff > 1 | Train Set | Test Set | External Set | p-value |
|---|---|---|---|---|---|---|---|---|---|---|
| Number of Aneurysms | 466 | 59 | 29 | 63 | 35 | 48 | 380 | 86 | 256 | |
| Symptomatic aneurysm | 41 (8.8%) | 14 (23.7%) | 4 (13.8%) | 15 (23.8%) | 6 (17.1%) | 7 (14.6%) | 29 (7.6%) | 9 (10.5%) | 74 (28.9%) | < 0.0001 |
| Calcification | 31 (6.7%) | 8 (13.6%) | 4 (13.8%) | 9 (14.3%) | 3 (8.6%) | 6 (12.5%) | 18 (4.7%) | 13 (15.1%) | 67 (26.2%) | < 0.0001 |
| Aneurysm location | < 0.0001 | |||||||||
| MCA | 309 (66.3%) | 33 (55.9%) | 12 (41.4%) | 34 (54.0%) | 23 (65.7%) | 21 (43.8%) | 255 (67.1%) | 54 (62.6%) | 164 (64.1%) | |
| ACA | 29 (6.2%) | 5 (8.5%) | 7 (24.1%) | 6 (9.5%) | 1 (2.9%) | 4 (8.3%) | 20 (5.3%) | 9 (10.5%) | 5 (2%) | |
| AComA | 116 (24.9%) | 21 (35.6%) | 10 (34.5%) | 23 (36.5%) | 10 (28.6%) | 23 (47.9%) | 99 (26.1%) | 17 (19.8%) | 61 (23.8%) | |
| PComA | 10 (2.1%) | 0 | 0 | 0 | 1 (2.9%) | 0 | 5 (1.3%) | 5 (5.8%) | 16 (6.3%) | |
| AChA | 2 (0.4%) | 0 | 0 | 0 | 0 | 0 | 1 (0.3%) | 1 (1.2%) | 10 (3.9%) | |
| Neck diameter; mean (range) in mm | 3.9 (1–12) | 4.3 (2–12) | 4.1 (2–8) | 4.6 (2–12) | 4.7 (2–12) | 4.3 (2–9) | 3.9 (1–12) | 3.8 (1–10) | 3.0 (1–10) | < 0.0001 |
| Maximum diameter; mean (range) in mm | 5.9 (1–25) | 7.2 (2–25) | 7.0 (3–20) | 8.1 (2–25) | 7.9 (3–25) | 7.7 (3–21) | 5.8 (1–25) | 6.3 (1–21) | 6.0 (1.7–25) | 0.1717 |
| Size of parenteral vessel | 2.0 (1–3) | 2 (1.6–3) | 2 (1.7–2.3) | 2.0 (1.6–3) | 2.1 (1.9–3) | 2.0 (2–3) | 2.0 (1.1–3) | 2.1 (1.7–3) | 2.6 (1–6) | < 0.0001 |
| Multiple aneurysms | 213 (45.7%) | 26 (44.1%) | 13 (44.8%) | 25 (39.7%) | 13 (37.1%) | 18 (37.5%) | 176 (46.3%) | 37 (43.0%) | 129 (50.4%) | 0.2284 |
| Irregular morphology / Lobulation | 172 (36.9%) | 30 (50.8%) | 17 (58.6%) | 32 (50.8%) | 12 (34.3%) | 27 (56.3%) | 145 (38.4) | 27 (31.4%) | 71 (27.7%) | 0.0101 |