Statistical analyses
Values are presented as means and standard deviation (SD) or median and interquartile range (IQR) as stated. The Friedman test was used to compare tDCS-induced sensations, followed by Wilcoxon signed-rank tests conducted with a Bonferroni correction for pair-wise comparisons (0.05/3 = Bonferroni corrected p = 0.017), in case of significant differences. The mean value of TTE, HR, SpOThe normal distribution of each data set was evaluated by the Shapiro–Wilk normality test. One-way repeated measures ANOVA was performed on the mean value of the study variables to analyze the main effect of the condition and when significant, the post hoc test using Bonferroni correction for multiple comparisons was used for the pairwise comparisons [