Preoperative factors of patients with single severe haemorrhage
| Characteristics | Overall | Time to surgery | P value | |
| ≤6 weeks | ＞6 weeks | |||
| No of patients | 69 | 40 | 29 | |
| Female (%) | 30 (43.5) | 19 (47.5) | 11 (37.9) | 0.429 |
| Children (%) | 9 (13.0) | 5 (12.5) | 4 (13.8) | 0.875 |
| Spinal level of CMs (%) | 0.188 | |||
| Cervical | 6 (8.7) | 5 (12.5) | 1 (3.5) | |
| Thoracolumbar | 63 (91.3) | 35 (87.5) | 28 (96.6) | |
| Locations in the horizontal plane (%) | 0.310 | |||
| Ventral | 20 (29.0) | 9 (22.5) | 11 (37.9) | |
| Central | 27 (39.1) | 16 (40.0) | 11 (37.9) | |
| Dorsal | 22 (31.9) | 15 (37.5) | 7 (24.1) | |
| MMS scale on admission (%) | 0.087 | |||
| 3 | 19 (27.5) | 13 (32.5) | 6 (20.7) | |
| 4 | 19 (27.5) | 7 (17.5) | 12 (41.4) | |
| 5 | 31 (44.9) | 20 (50.0) | 11 (37.9) | |
| Lesion size (%) | 0.964 | |||
| <10.0 mm | 45 (65.2) | 26 (65.0) | 19 (65.5) | |
| ≥10.0 mm | 24 (34.8) | 14 (35.0) | 10 (34.5) | |
| Multiple lesions (%) | 9 (13.0) | 4 (10.0) | 5 (17.2) | 0.378 |
CM, cavernous malformation; MMS, Modified McCormick Scale.