Table 1.
Comparisons of clinical data at baseline between MF FI ≥ 25% and FI < 25% groups in complete cohort
| Variable | FI ≥ 25% (n = 226) | FI < 25%(n = 235) | P value |
|---|---|---|---|
| Age (years) | 62.0 ± 7.3 | 58.0 ± 7.4 | < 0.001** |
| Sex (male/female) | 69:157 | 116:119 | < 0.001** |
| BMI (kg/m2) | 26.0 ± 3.4 | 26.1 ± 3.3 | 0.815 |
| Fusion to S1 (no: yes) | 134:92 | 145:89 | 0.533 |
| Number of fusion levels | 1.9 ± 0.9 | 1.9 ± 0.9 | 0.937 |
| Osteoporosis (no: yes) | 145:79 | 185:47 | < 0.001** |
| Spondylolisthesis (no: yes) | 123:67 | 121:40 | 0.035* |
| Smoking (no: yes) | 194:32 | 200:35 | 0.823 |
| Diabetes (no: yes) | 189:37 | 201:34 | 0.571 |
| MF FI (%) | 36.3 ± 9.2 | 18.3 ± 4.7 | < 0.001** |
| Baseline | |||
| VAS for back pain | 5.4 ± 2.0 | 5.1 ± 2.2 | 0.268 |
| VAS for leg pain | 6.1 ± 2.1 | 5.8 ± 2.3 | 0.186 |
| ODI | 41.5 ± 18.8 | 41.0 ± 20.3 | 0.591 |
The numbers in bold represented that there was significant difference between the two groups
*P < 0.05, **P < 0.01