Table 1.
Demographic and radiological factors regarding ACS using univariate analysis.
| Variables | Group A, n (%) or mean ± SD | Group non-A, n (%) or mean ± SD | P value |
|---|---|---|---|
| Number of patients | 62 (8.5) | 670 (91.5) | |
| Age (years) | 73.1 ± 10.1 | 66.8 ± 11.4 | <.01** |
| Sex | .31 | ||
| Male | 38 (61.3) | 453 (67.6) | |
| Female | 24 (38.7) | 217 (32.4) | |
| Height (cm) | 156.0 ± 9.2 | 160.0 ± 9.9 | <.01** |
| Body weight (kg) | 55.8 ± 9.7 | 61.2 ± 12.3 | <.01** |
| BMI (kg/m2) | 22.8 ± 2.8 | 23.8 ± 3.6 | .045* |
| Follow-up period (months) | 23.4 ± 9.0 | 22.2 ± 8.3 | .27 |
| C2-C7 angle (°) | |||
| Neutral | 12.2 ± 14.3 | 12.9 ± 13.2 | .70 |
| Flexion | −9.4 ± 15.1 | −9.9 ± 12.4 | .82 |
| Extension | 23.1 ± 14.7 | 24.4 ± 13.4 | .48 |
| ROM (°) | 33.5 ± 13.4 | 34.9 ± 13.4 | .54 |
| C2-C7 SVA (mm) | 27.2 ± 14.5 | 22.8 ± 13.9 | .02* |
Abbreviations: ACS, anterior cervical spondylolisthesis; Group A, patients with preoperative ACS; Group non-A, patients without ACS; BMI, body mass index; ROM, range of motion; C2–C7 SVA, C2–C7 sagittal vertical axis. * indicates P <0.05, ** indicates P <0.01.