Table 2 Comparisons of clinical data and patient-reported outcomes after case–control matching
Variable | FI > 25% (n = 160) | FI < 25% (n = 160) | P value |
|---|---|---|---|
Age (years) | 60.7 ± 7.0 | 59.9 ± 6.7 | 0.231 |
Sex (female/male) | 56:104 | 56:104 | 1.000 |
BMI (kg/m2) | 25.9 ± 3.6 | 26.0 ± 3.4 | 0.929 |
Fusion to S1 (no:yes) | 93:67 | 100:60 | 0.424 |
Number of fusion levels | 1.9 ± 0.9 | 1.9 ± 0.8 | 0.581 |
Osteoporosis (no:yes) | 113:47 | 115:45 | 0.805 |
Spondylolisthesis (no:yes) | 88:48 | 90:36 | 0.244 |
Smoking (no:yes) | 132:28 | 141:19 | 0.155 |
Diabetes (no:yes) | 137:23 | 138:22 | 0.872 |
MF FI (%) | 36.6 ± 9.7 | 18.9 ± 4.5 | < 0.001** |
Baseline | |||
VAS for back pain | 5.4 ± 2.0 | 5.3 ± 2.3 | 0.819 |
VAS for leg pain | 6.0 ± 2.1 | 5.9 ± 2.4 | 0.931 |
ODI | 41.3 ± 18.6 | 40.6 ± 19.9 | 0.684 |