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. 2018 Oct 4;11:2179–2188. doi: 10.2147/JPR.S163340

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Changes in von Frey.

Notes: Evolution of tactile detections: before the procedure, the von Frey data of group A and group B have no significant difference. After the ozone treatment, no significant changes have been found in both groups, but the von Frey of group B was higher than group A and there was a significant difference. *P<0.05 compared with group A. Group A, pain duration <3 months; Group B, pain duration ≥3 months. Group A, pain duration <3 months; Group B, pain duration ≥3 months.