Table 1.
Study group characteristics
| Group 1 (Critical DSS) | Group 2 (Relative DSS) | Group 3 (Non- DSS) | p-value | |
|---|---|---|---|---|
| Vertebral Levels | 27 | 148 | 15 | |
| Gender | F: 11 | F: 19 | F: 4 | 0.65 |
| M: 6 | M: 10 | M:10 | ||
| Mean Age at Surgery (Years (±SD)) | F: 68.0 (11.0) | F: 67.1 (10.4) | F: 64.5 (9.0) | 0.26 |
| M: 67.0 (10.3) | M: 62.1 (12.9) | M: 47.4 (26.8) | ||
| Mean LF thickness (mm (±SD)) | R: 3.8 (1.4) | R: 3.4 (1.7) | R: 3.1 (0.6) | R: 0.45 |
| L: 4.0 (1.7) | L: 3.4 (1.6) | L: 3.3 (1.1) | L: 0.30 | |
| Mean Spinal Canal Diameter (mm (±SD)) | 12.7 (1.3) | 15.4 (1.3) | 17.7 (2.6) | <0.001* |
| Mean Disc Height (mm (±SD)) | 10.4 (2.3) | 9.9 (2.5) | 9.7 (2.9) | 0.58 |
| BMI (±SD) | 22.8 (2.3) | 24.3 (3.2) | 26.7 (3.7) | 0.06 |
LF ligamentum flavum, BMI body mass index, SD standard deviation, F female, M male, R right, L left
*significant difference between three study groups