Table 4.
Demographic and radiological factors regarding progression of ACS using univariate analysis.
| Variables | Group P, n (%) or mean ± SD | Group non-P, n (%) or mean ± SD | P value |
|---|---|---|---|
| Number of patients | 17 (2.3) | 715 (97.7) | |
| Age (years) | 70.3 ± 9.3 | 67.3 ± 10.5 | .29 |
| Sex | .83 | ||
| Male | 11 (64.7) | 480 (67.1) | |
| Female | 6 (35.3) | 235 (32.9) | |
| Height (cm) | 155 ± 11.1 | 160 ± 9.8 | .049* |
| Body weight (kg) | 56.9 ± 11.4 | 60.8 ± 12.2 | .19 |
| BMI (kg/m2) | 23.2 ± 3.5 | 23.7 ± 3.5 | .63 |
| Follow-up period (months) | 25.6 ± 8.4 | 22.2 ± 8.4 | .10 |
| Presence of preoperative ACS | 4 (23.5) | 58 (8.1) | .048* |
| C2-C7 angle (°) | |||
| Neutral | 6.3 ± 9.3 | 13.0 ± 13.4 | .04* |
| Flexion | −15.1 ± 10.5 | −10.1 ± 12.3 | .11 |
| Extension | 17.6 ± 10.5 | 24.5 ± 13.5 | .04* |
| ROM (°) | 32.7 ± 10.6 | 34.8 ± 13.5 | .54 |
| C2-C7 SVA (mm) | 26.9 ± 10.7 | 23.1 ± 14.1 | .26 |
Abbreviations: ACS, anterior cervical spondylolisthesis; Group P, patients with postoperative progression of ACS; Group non-P, patients without postoperative progression of ACS; BMI, body mass index; ROM, range of motion; C2–C7 SVA, C2–C7 sagittal vertical axis. * indicates P <0.05.