Table 1.
Baseline characteristics of the study population
| 6w-group (n = 41) | 12w-group (n = 41) | |
|---|---|---|
| Age ± SD | 52.0 (SD 8.5) | 51.3 (SD 9.9) |
| Gender (% male) | 53 % (21) | 42 % (17) |
| Body mass index (kg/m2± SD) | 27.8 (SD 5.1) | 28.4 (SD 4.4) |
| Occupational status | ||
| Workforce (sick listed) | 64 % (26) | 61 % (25) |
| Social security | 7 % (3) | 7 % (3) |
| Early retirement | 5 % (2) | 12 % (5) |
| Disability pension | 24 % (10) | 20 % (8) |
| Diagnosis | ||
| Isthmic spondylolisthesis grade I–II | 12 % (5) | 15 % (6) |
| Degenerative disc disease | 88 % (36) | 85 % (35) |
| Surgical procedures | ||
| PLF | 76 % (31) | 85 % (35) |
| TLIF | 24 % (11) | 15 % (6) |
| Decompression | 85 % (35) | 73 % (30) |
| Earlier spondylodesis | 19 % (8) | 21 % (9) |
| Fusion levels (median/25.p/75.p) | 2 (1;2) | 2 (1;2) |
| Quality of life (EQ-5D) | 0.66 (0.39;0.72) | 0.63 (0.44;0.71) |
PLF posterior lumbar fusion, TLIF transformational lumbar interbody fusion