Demographic data.
| Variable | Value Count (%) or Mean (SD) |
| N | 16 (100%) |
| Age (years) | 56.9 (11.4) |
| Female | 13 (81.3%) |
| BMI (kg/m2) | 30.8 (5.3) |
| Grade 1 spondylolisthesis | 16 (100%) |
| Hypertension | 7 (43.8%) |
| Dyslipidemia | 2 (12.5%) |
| Diabetes mellitus type 2 | 4 (25.0%) |
| Coronary artery disease | 2 (25.0%) |
| Rheumatoid arthritis | 0 (0.0%) |
| Operative level | |
| L1-L2 | 0 (0%) |
| L2-L3 | 1 (6.3%) |
| L3-L4 | 3 (18.8%) |
| L4-L5 | 9 (56.3%) |
| L5-S1 | 3 (18.8%) |