Kruskal–Wallis tests revealed significant between-group differences for Mean RR ( p < 0.001), SDNN RR ( p < 0.001), and pNN50 RR ( p < 0.001), whereas RMSSD RR did not reach statistical significance ( p = 0.115).
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Age-dependent patterns of cardiac complexity unveiled by topological data analysis of pediatric heart rate variability.
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