Table 3.
Demographic characteristics of participants
| Total | Male | Female | |
| n=239 | n=86 | n=153 | |
| Age (y) (mean ±SD) | 65.3±11.0 | 65.4±11.3 | 65.3±10.9 |
| BMI (kg/m2) | 23.4±3.1 | 23.3±3.0 | 23.4±3.1 |
| Distribution of age (y) (n [%]) | |||
| <50 | 18 (7.5) | 7 (8.1) | 11 (7.2) |
| 50-59 | 46 (19.2) | 17 (19.8) | 29 (20.0) |
| 60-69 | 78 (32.6) | 26 (30.2) | 52 (34.0) |
| ≥70 | 97 (40.6) | 36 (41.9) | 61 (39.9) |
| Classifications of MRI (n [%]) | |||
| Central stenosis | |||
| Grade A | 129 (54.0) | 44 (51.2) | 85 (55.6) |
| Grade B | 73 (30.5) | 28 (32.6) | 45 (29.4) |
| Grade C | 30 (12.6) | 11 (12.8) | 19 (12.4) |
| Grade D | 7 (2.9) | 3 (3.5) | 4 (2.6) |
| LRS | |||
| Grade 0 | 8 (3.3) | 3 (3.5) | 5 (3.3) |
| Grade 1 | 67 (28.0) | 25 (29.1) | 42 (27.5) |
| Grade 2 | 98 (41.0) | 30 (34.9) | 68 (44.4) |
| Grade 3 | 66 (27.6) | 28 (32.6) | 38 (24.8) |
| Sedimentation sign | |||
| Positive | 80 (33.5) | 28 (32.6) | 52 (34.0) |
| Negative | 159 (66.5) | 58 (67.4) | 101 (66.0) |
| FJE | |||
| Grade 0 | 5 (2.1) | 1 (1.2) | 4 (2.6) |
| Grade 1 | 171 (71.5) | 59 (68.6) | 112 (73.2) |
| Grade 2 | 63 (26.4) | 26 (30.2) | 37 (24.2) |
Abbreviations: LSS, lumbar spinal stenosis; LRS, lateral recess stenosis; FJE, facet joint effusion.