## 3 Results
### Study of Impact of Series of WBC on Selected Skin Characteristics
Subsequent tests indicated that the results after a series of 4 weeks of treatments were significantly different from baseline (\(p\) = 0.012; d = \(-\)0.793) and also those after 2 weeks (\(p\) = 0.022; d = \(-\)0.826). When the type of group was included in the analysis, it was indicated that only the results obtained in the SG group were responsible for these differences. Thus, the results after the full 4-week series in the obese and overweight group were significantly different from the baseline results of this group (\(p\) = 0.004; d = \(-\)1500) and the results after the 9-treatment series (\(p\) = 0.002; d = \(-\)1820). In contrast, there were no differences between skin hydration at baseline and after 9 treatments. The results of the traumatic measurements showing the magnitude of TEWL are shown in Figure 4. Significant differences were indicated for measurements on the face (\(p\) = 0.002; \(\omega^{2}\) = 0.124), and a measurement x group interaction was also indicated (\(p\) < 0.001; \(\omega^{2}\) = 0.287). Assessing the significance of the effect of the number of treatments on the state of the skin barrier assessed rewarmetrically, only a trend for the significance of difference I vs III was indicated. However, the results after 19 treatments were significantly different from the baseline (\(p\) = 0.003; d = \(-\)0.970). At the same time, the skin condition after 9 and 19 treatments did not differ. When group type was added to the analysis, it was indicated that baseline SC and CG scores differed significantly (\(p\) < 0.001; d = 1.665). In the obese and overweight group, significant differences were indicated after 9, when the lowest scores were observed, and after 19 treatments, where the highest TEWL values were indicated. For normal-weight subjects, baseline results differed from those determined after 9 treatments (\(p\) < 0.001; d = \(-\)2.064) and after 19 treatments (\(p\) = 0.003; d = \(-\)1.640). Both series lengths induced a significant increase in TEWL in this group. Tewameter results on the skin of the forearms were significantly different (\(p\) = 0.006; \(\omega^{2}\) = 0.132), and a measurement x group interaction was indicated (\(p\) < 0.001; \(\omega^{2}\) = 0.225). It was indicated that the results after the 19 th treatment were significantly higher than baseline (\(p\) = 0.028; d = \(-\)0.849) and those determined after nine treatments (\(p\) = 0.022; d = \(-\)0.928). Taking the group additionally into account, it was indicated that the baseline scores of participants in the two groups did not differ. The study group indicated significantly higher results after the full 4-week series of treatments compared to those obtained after 2 weeks (\(p\) < 0.001; d = \(-\)2.154). Figure 3: Measurement of hydration [IU] of the skin of the face and forearms in a group of obese or overweight (SG) and normo-weight (CG) subjects taken before the project (I), after a series of 9 treatments (III) and 19 treatments (V) WBC. The results of skin acid-base (pH) measurements are shown in Figure 5. Significant differences were indicated for measurements collected on facial skin only for the outcome x group interaction (\(p<0.001\); \(\omega^{2}=0.196\)). Post hoc tests indicated significantly higher indications for SG after 9 treatments (\(p=0.042\); d = \(-1.325\)) with a return decrease after another 2 weeks (III vs. V: \(p=0.001\); d = \(1.709\)). It was also indicated that the SG group responded differently to a series of nine treatments, and in Measure III, SG results were significantly different from CG (\(p=0.003\); d = \(1.831\)). As with skin pH on the face, on the forearm significant differences occurred only for the outcome \(\times\) group interaction (\(p=0.007\); \(\omega^{2}=0.133\)). The directions of change for both groups closely resembled what was observed on facial skin. pH in the SG increased significantly in Measure III (difference vs. CG \(p=0.011\); d = \(1.354\)) and decreased in Measure V (difference vs. III \(p=0.005\); d = \(1.757\)).