Long-term outcome in different treatment groups after 12 months.
| Variable | Group Gly-20 | Group EA-95 | Group RFD | Total |
| WHO-pain level (12 mo) | 1.39 ± 0.70 | 1.61 ± 0.97 | 1.41 ± 1.12 | 1.47 ± 0.93 |
| VAS (12 mo) | 6.68 ± 2.29a | 5.72 ± 3.54 | 4.72 ± 3.25a | 5.73 ± 3.11 |
| COMI-back (12 mo) | 7.44 ± 2.40 | 6.30 ± 3.63 | 5.96 ± 3.25 | 6.60 ± 3.13 |
aP < 0.05: Gly-20 vs RFD.
COMI-back, Core Outcome Measures Index for the back; EA-95, ethyl alcohol 95%; Gly-20, glycerol 20%; RFD, radiofrequency denervation; VAS, visual analog scale; WHO, World Health Organization.