Tonsil displacements during the cardiac cycle in controls and patients with Chiari I malformation with and without syringomyelia
| No. | Tonsil Displacement (mm) | SD (mm) | Range (mm) | |
|---|---|---|---|---|
| Controls | 6 | 0.43 | 0.06 | 0.12–0.71 |
| Patients with Chiari I | 11 | 0.57 | 0.04 | 0.23–0.78 |
| Without syringomyelia | 7 | 0.50 | 0.05 | 0.23–0.71 |
| With syringomyelia | 4 | 0.61 | 0.03 | 0.45–0.78 |