Fig. 3From: Efficacy and safety of pulsed radiofrequency modulation of thoracic dorsal root ganglion or intercostal nerve on postherpetic neuralgia in aged patients: a retrospective studyThe changes in VAS of the two groups. VAS, visual analogue scale DRG group, dorsal root ganglion pulsed radiofrequency group, ICN group, Intercostal nerves radiofrequency group. *P < 0.050 compared to DRG group, **P < 0.010 compared to DRG group. PRF, pulsed radiofrequency. DRG, dorsal root ganglion. ICN, intercostal nerve. VAS, Visual Analogue ScaleBack to article page