Table 4. Correlations of postoperative JOA score and various factors.
| No. of patients | Postoperative JOA score | P value | |
| Gender | |||
| Male | 84 | 13.64±1.73 | 0.528 |
| Female | 49 | 13.80±1.92 | |
| Age (years) | |||
| <60 | 72 | 13.54±1.68 | 0.323 |
| ≥60 | 61 | 13.99±1.95 | |
| Duration of symptoms (months) | |||
| <24 | 51 | 14.12±2.14 | 0.001 |
| ≥24 | 82 | 13.44±1.83 | |
| Smoking status | |||
| Yes | 41 | 13.28±2.23 | 0.245 |
| No | 92 | 13.89±1.38 | |
| Combined with diabetes | |||
| Yes | 55 | 13.47±1.56 | 0.627 |
| No | 78 | 13.86±1.93 | |
| Preoperative JOA score | |||
| <9 | 48 | 12.80±2.43 | 0.000 |
| ≥9 | 85 | 14.20±1.84 | |
| Levels of corpectomies | |||
| 1 to 2 levels | 98 | 14.09±2.13 | 0.000 |
| ≥3 levels | 35 | 12.60±1.94 | |
| OR of OPLL (%) | |||
| <50 | 74 | 13.84±1.84 | 0.345 |
| ≥50 | 59 | 13.52±1.92 | |
| Dural ossification | |||
| Yes | 42 | 13.57±2.18 | 0.534 |
| No | 91 | 13.76±1.39 | |
| HIZ on T2-wieghted MRI | |||
| Yes | 61 | 13.41±1.45 | 0.237 |
| No | 72 | 13.95±1.92 |
JOA, Japanese Orthopedic Association; OPLL, ossification of the posterior longitudinal ligament; OR, occupying rate, HIZ, high intensity zone.