Analysis of the CO group
HEART
The analysis of the control group (CO) was performed analogically to the analysis of the CS group. In the first step of the analysis, the non-parametric Friedman test for HR (Heart Rate) was applied to the coupled data and a p-value < 0.0001 was obtained. This means that there is a statistically significant difference between the compared HR values. Then, the Nemenyi multiple test was applied for further detailed conclusions and the p-values obtained are presented in Table P-values of the Nemenyi test of HR for the CO group.Values in bold—statistically significant differences, NS—no statistically significant differences.The dendrogram of hierarchical clustering with Euclidean measure and complete method for HR in the CO group is shown in Fig. A dendrogram of similarities between the HR values in the CO group based on hierarchical cluster analysis according to the complete clustering method.An analysis of the HF (High Frequency) data was also performed in the CO group. After applying the non-parametric Friedman test for the coupled data, a p-value < 0.0001 was obtained. This means that there is a statistically significant difference between the compared HF objects. Then, for further detailed conclusions, the Nemenyi multiple test was performed and the obtained p-values are shown in Table P-values of the Nemenyi test of HF for the CO group.Values in bold—statistically significant differences, NS—no statistically significant differences.Figure A dendrogram of similarities between the HF values in the CO group based on hierarchical cluster analysis according to the complete clustering method.The last category of objects analysed in the CO group were LF (Low Frequency) values of heart rate variability. After applying the non-parametric Friedman test for coupled data, a p-value < 0.0001 was obtained. This means that there is a statistically significant difference between the compared LF values (objects). Then, for further de-tailed conclusions, the Nemenyi multiple test was performed and the obtained p-values are shown in Table P-values of the Nemenyi test of LF for the CO group.Values in bold—statistically significant differences, NS—no statistically significant differences.The dendrogram showing the hierarchical grouping with Euclidean measure and complete method for LF values in the CO group is presented in Fig. A dendrogram of similarities between the LF values in the CO group based on hierarchical cluster analysis according to the complete clustering method.