Table 1.
Baseline characteristics of patients included in the case group and control group.
| Case group | Control group | P-value | |
|---|---|---|---|
| Sample size | 30 | 30 | |
| Gender (Male/Female) | 18/12 | 21/9 | 0.417# |
| Age (years) | 55.2±11.1 | 54.8±10.7 | 0.980* |
| Course of disease (month) | 27.9±20.7 | 28.7±18.2 | 0.823* |
| Preoperative JOA score | 9.27±1.81 | 9.12±1.48 | 0.599* |
| OPLL society of Japan | |||
| Localized type | 3 | 4 | 0.697# |
| Continuous type | 11 | 10 | |
| Segmental type | 9 | 12 | |
| Mixed type | 7 | 4 | |
| Spinal stenosis rate (%) | 42.1±10.5 | 42.6±11.3 | 0.968# |
*
Using the rank sum test (Mann-Whitney test);
#
using chi square test.
JOA – Japanese Orthopaedic Association; JOA – Japanese Orthopaedic Association; OPLL – ossification of posterior longitudinal ligament; OPLL – ossification of posterior longitudinal ligament.