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Boxplots reporting the absolute errors distribution for each HRV parameter. Square brackets plus an asterisk indicate statistical significance (p < 0.05), according to the pairwise comparison post hoc analysis. The full scale is defined with reference to the Bland–Altman plots for the HRV parameters (Figure 3). Red cross stands for an outlier. Abbreviations: NR = No Risk; LR = Low Risk; HR = High Risk.
