. Author manuscript; available in PMC: 2017 Aug 1.

Published in final edited form as: Conf Proc IEEE Eng Med Biol Soc. 2016 Aug;2016:6397–6400. doi: 10.1109/EMBC.2016.7592192

TABLE III.

List of HRV features used in this work for estimating sedation level.

Domain	Features
Time	Maximum, minimum, mean, median of NN, Standard deviation of NN (SDNN), percentage of consecutive NNs that vary by 5, 10, 15, 20, 25, 30 ms (pNNx), Root mean square of SDNN (RMSDD), mean heart rate (MHR), Standard deviation of heart rate (SDHR), HRV triangular index, coefficient of variation, Max change in NN (MCNN), Mean of the absolute value of first derivative of NN (MAFDNN), Nonlinear energy, Line length.
Frequency	PVLF-Power in very low frequency spectrum (0.003–0.04 Hz), PLF-Power in low frequency spectrum (0.04–0.15Hz), PHF-Power in high frequency spectrum (0.15–0.4 Hz) PLF/PHF, PLF/PTOT × 100, PTOT is the total power spectrum PHF/PTOT × 100.
Nonlinear	Poincare plot measures (SD1, SD2).
Complexity	Shannon entropy, Spectral entropy, Kolmogorov complexity.