Table 2. Comparison of patient demographics and baseline outcomes between satisfied and unsatisfied groups.
| Parameters | Satisfied group | Unsatisfied group | p value |
|---|---|---|---|
| Age at the operation (y) | 62.4 ± 12.6 | 67.4 ± 12.7 | 0.071 |
| Gender (M/F) | 62/33 | 16/5 | 0.334 |
| Ratio of OPLL patients | 0.35 (33/95) | 0.29 (6/21) | 0.588 |
| Duration of symptom (mo) | 34.5 ± 49.5 | 33.8 ± 34.9 | 0.412 |
| CIRS | 6.7 ± 3.2 | 7.8 ± 2.2 | 0.052 |
| Radiograph | |||
| C2/7 angle (degree) | 12.4 ± 10.0 | 10.1 ± 10.7 | 0.257 |
| Range of motion (degree) | 35.8 ± 12.7 | 36.2 ± 10.0 | 0.917 |
| MRI | |||
| Narrowest canal area (mm3) | 62.4 ± 16.4 | 66.5 ± 12.7 | 0.158 |
| Ratio of type 2 intramedullary SI | 0.35 (33/94) | 0.43 (9/21) | 0.505 |
| JOA score | 11.0 ± 2.7 | 11.5 ± 1.6 | 0.628 |
| SF-36 | |||
| Physical functioning | 46.5 ± 28.3 | 38.8 ± 27.4 | 0.323 |
| Role-physical | 39.2 ± 28.6 | 39.6 ± 34.1 | 0.880 |
| Bodily pain | 47.7 ± 26.3 | 33.5 ± 18.3 | 0.031a |
| General health perceptions | 46.2 ± 17.5 | 35.5 ± 14.1 | 0.018a |
| Vitality | 45.4 ± 21.3 | 35.2 ± 13.9 | 0.027a |
| Social functioning | 57.6 ± 27.8 | 61.7 ± 31.8 | 0.511 |
| Role-emotional | 47.8 ± 31.8 | 53.3 ± 37.4 | 0.581 |
| Mental health | 58.7 ± 21.1 | 48.8 ± 23.0 | 0.094 |
Abbreviations: CIRS, Cumulative Illness Rating Scale; JOA, Japanese Orthopaedic Association; OPLL, ossification of posterior longitudinal ligament; SF-36, MOS 36-Item Short-Form Health Survey; SI, signal intensity.
Note: Unless otherwise indicated, values are expressed as the mean ± standard deviation.
a
Statistically significant (p < 0.05, Mann-Whitney U test or chi-square test).