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Average of roughness parameters ((a), Ra, the mean roughness of the skin; (b), Rt, the maximum relief height, and (c), Rz, average maximum profile height). Results shown are mean ± SD of three determinations for each volunteer at different measurement times. Data were analyzed by two-way RM (repeated measures) ANOVA (analysis of variance), followed by a Bonferroni adjustment. Data were significant different p value < 0.05 (p < 0.05 *; p < 0.001 ***).
