Machine learning-based stratification of chagas heart failure severity using ECG power spectral biomarkers.

Finally, it should be emphasized that, although a slight trend toward lower-frequency displacement shown by some features is observable between the Normal and Moderate groups, these differences did not reach statistical significance (Bonferroni-corrected ), indicating that the spectral shift becomes substantial only from Moderate to Severe.

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This outcome is not unexpected, as the statistical analysis showed that Normal and Moderate differ only slightly, although some features exhibit a mild trend toward lower-frequency displacement.

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