Mean difference and SEM in the questionnaire items before and after stimulation.

The values in brackets relate to the difference between before and after the stimulation as assessed by the Wilcoxon test. Comparison between MHI and control was done using the Mann-Whitney's U test. The last column reports the effect size r. Asterisks indicate a significant difference between the MHI and the control condition (one asterisk p<0.05, two asterisks p<0.01). All p-values are corrected with Bonferroni-Holm correction.