Disc height at different levels between the 2 groups of buckling.
| Level | Group A, Buckling≤0.1 mm (n = 798) | Group B, Buckling>0.1 mm (n = 216) | P Value | ||
| n | Mean (SD) | n | Mean (SD) | ||
| C2-C3 | 156 | 0.71 (0.14) | 13 | 0.74 (0.09) | 0.435 |
| C3-C4 | 136 | 0.68 (0.13) | 33 | 0.68 (0.13) | <0.001 |
| C4-C5 | 97 | 0.72 (0.71) | 72 | 0.71 (0.11) | 0.545 |
| C5-C6 | 112 | 0.76 (0.17) | 57 | 0.72 (0.10) | 0.068 |
| C6-C7 | 148 | 0.70 (0.17) | 21 | 0.83 (0.02) | <0.001 |
| C7-T1 | 149 | 0.72 (0.19) | 20 | 0.71 (0.28) | 0.901 |