Table 4 Diagnostic characteristics
|  | FBSS + (n = 56) | FBSS-(n = 277) | P value |
|---|---|---|---|
Symptom location(n) | Â | Â | 0.03 |
 Low back pain without limb symptoms | 3 | 6 |  |
 Unilateral limb symptom | 31 | 201 |  |
 Bilateral limb symptom | 22 | 70 |  |
 Symptom duration(Month) | 70.64 ± 95.2 | 57.9 ± 70.1 | 0.766 |
 Aggravation(Yes/No) | 40/16 | 220/57 | 0.187 |
Claudication(n) |  |  | < 0.001 |
 No Claudication | 22 | 229 |  |
 Claudication distances > 100 m | 12 | 28 |  |
 Claudication distances ≤ 100 m | 22 | 20 |  |
Analgesic application(Yes/No) | 34/22 | 175/102 | 0.728 |
Pre-op NRS-Back pain | 6.1 ± 3.1 | 6.3 ± 2.8 | 0.836 |
Pre-op NRS-Leg pain | 6.3 ± 2.7 | 7.3 ± 2.2 | 0.005 |