Fig. 3

Effects of the experimental period on numeric pain scale (NPS) score including both treatment groups. D-2 refers to 2 days before the day of the first treatment (D1), D1PRE to just before the first treatment, D1POST to immediately after the first treatment, D5 to 5 days after the first treatment, D7PRE to just before the second treatment, and D7POST to immediately after the second treatment. *** represents p < 0.001. n = 17