Table 4. Surgical procedures of CM-1 patients, spinal decompression cohort, and non-spinal decompression cohort.
| Surgical procedure | CM-1 patients (N=5,438) | Spinal decompression (N=3,596) | Non-spinal decompression (N=941) | P value |
|---|---|---|---|---|
| Cranial decompression, n (%) | 1,410 (25.9) | 469 (13.0) | 941 (100.0) | <0.001* |
| Craniectomy, n (%) | 647 (11.9) | 467 (13.0) | 31 (3.3) | <0.001* |
| Meninges repair, n (%) | 2,734 (50.3) | 2,169 (60.3) | 309 (32.8) | <0.001* |
| Other brain lesion excision, n (%) | 249 (4.6) | 144 (4.0) | 32 (3.4) | 0.226 |
| Other spinal cord operations, n (%) | 385 (7.1) | 295 (8.2) | 49 (5.2) | 0.001* |
| Cranial nerve decompression, n (%) | 129 (2.4) | 32 (0.9) | 97 (10.3) | <0.001* |
| Fusion surgery, n (%) | 36 (0.7) | 38 (1.1) | 12 (1.3) | <0.001* |
*, significance of P<0.05. CM-1, Chiari malformations type 1.