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. 2015 Mar 20;10(3):e0118504. doi: 10.1371/journal.pone.0118504

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© 2015 Melillo et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 3 — The decision tree shows the set of rules adopted for classify high and low risk subjects: if HRVTi is higher than 13.6, the subject is classified as low risk, otherwise if SampEn lower than 0.997 or LF% lower than 18.1%, the subject is classified as high risk. The remaining subjects (with higher SampEn and LF_%), are classified based on LF and CF: as high risk, if LF is higher than 0.001 s² and CD is lower 3.43, otherwise as low risk. HRVTi: HRV Triangular Index. SampEn: Sample Entropy. LF: Low Frequency. LF_%: Low Frequency expressed as percentage of Total Power. CD: correlation dimension.