Table 2. Comparison of patient characteristics between good and poor surgical outcome groups.
| Variable | Good (n = 56) | Poor (n = 40) | P-value |
|---|---|---|---|
| Age at operation (yr) | |||
| <60 | 16 | 7 | 0.022 |
| 60–70 | 26 | 12 | |
| >70 | 14 | 21 | |
| Male sex (n, %) | 39 (69.6%) | 27 (67.5%) | 0.823 |
| Diabetes mellitus (n, %) | 15 (26.8%) | 8 (20.0%) | 0.443 |
| Duration of symptoms (mo) | |||
| <6 | 28 | 9 | 0.006 |
| 6–12 | 13 | 8 | |
| >12 | 15 | 23 | |
| Preoperative JOA score | 5.7 ± 1.7 | 5.4 ± 1.4 | 0.436 |
| Postoperative JOA score | 9.2 ± 0.8 | 7.2 ± 0.9 | 0.000 |
| Preoperative SCR | |||
| <1.54 | 39 | 16 | 0.004 |
| ≥1.54 | 17 | 24 | |
| OLF level | |||
| T1-T5 | 4 | 3 | 0.452 |
| T5-T9 | 3 | 5 | |
| T9-T12 | 49 | 32 | |
| Number of OLF Levels | |||
| 1 | 33 | 20 | 0.613 |
| 2 | 17 | 16 | |
| >2 | 6 | 4 | |
| Ossification of dura mater (n, %) | 27(48.2%) | 21(52.5%) | 0.679 |
| CT axial classification | |||
| Lateral | 10 | 4 | 0.716 |
| Extended and enlarged | 12 | 10 | |
| Fused | 30 | 22 | |
| Tuberous | 4 | 4 | |
| Surgical technique | |||
| Laminectomy | 50 | 36 | 1.000 |
| Posterior decompression and fusion | 6 | 4 | |
| Complications | |||
| Hematoma | 2/56(3.6%) | 2/40(5.0%) | 1.000 |
| CSF leakage | 3/56(5.4%) | 4/40(10.0%) | 0.446 |
| Wound infection | 0/56(0%) | 1/40(2.5%) | 0.417 |
JOA: Japanese Orthopaedic Association; SCR: signal change ratio; OLF: ossification of the ligamentum flavum; CT: computed tomography; CSF: cerebrospinal fluid; mo: month; yr: year