Statistical analysis of C1–C2 posterior thecal sac measurements in various neck positions
| Position | Analysis Variable: Distance (mm) | |||||
|---|---|---|---|---|---|---|
| No. | Mean | Median | SD | Minimum | Maximum | |
| Prone extension | 10 | 5.00 | 4.69 | 1.29 | 3.19 | 7.16 |
| Prone flexion | 10 | 4.00 | 3.72 | 1.12 | 2.42 | 6.21 |
| Supine extension | 10 | 4.76 | 4.85 | 1.23 | 3.03 | 7.03 |
| Supine flexion | 10 | 3.62 | 3.18 | 1.25 | 1.56 | 5.56 |