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. 2021 Apr 14;11:8123. doi: 10.1038/s41598-021-87489-0

Table 2.

Accuracy of the estimated HRV parameters aggregated over all analyzed 5-min windows of all subjects.

Parameter MAE MAE (%) RMSE RMSE (%) P05 P95 Bias Bias (%) SD
EE [kcal/min] 0.0213 1.49 0.1540 7.33 − 0.0501 0.0293 0.0018 0.13 0.1540
TRIMP [kTRIMP/min] 0.1852 6.55 1.3042 10.23 0.0000 0.2963 0.0986 3.49 1.3006
SI [–] 2.2950 10.75 3.7738 16.29 − 7.9781 2.2682 − 1.4460 − 6.77 3.4860
Mean NN [ms] 1.8748 0.20 4.0133 0.42 − 1.7276 7.0315 1.1709 0.12 3.8390
SDNN [ms] 1.7143 8.94 2.8611 12.66 − 3.0127 3.7421 0.3891 2.03 2.8347
Mean HR [BPM] 0.1259 0.20 0.2646 0.41 − 0.4574 0.1544 − 0.0645 − 0.10 0.2566
SDHR [BPM] 0.1292 10.18 0.2756 18.93 − 0.2222 0.2816 0.0251 1.98 0.2745
Min. HR [BPM] 0.1884 0.31 0.5274 0.85 − 0.1429 0.6322 0.0931 0.15 0.5192
Max. HR [BPM] 0.8199 1.18 2.6971 3.83 − 3.3757 0.2343 − 0.7047 − 1.02 2.6036
RMSSD [ms] 3.5506 17.15 4.5453 18.34 − 3.4138 8.3910 2.4160 11.67 3.8504
NN50 [beats] 4.5662 28.60 8.2695 23.95 − 10.0000 14.0000 1.5054 9.43 8.1319
pNN50 [%] 1.5457 28.00 2.7441 22.59 − 2.6778 5.1406 0.7025 12.73 2.6529
Tri. Indx [–] 0.6585 12.19 0.8661 14.31 − 1.4889 1.2480 0.0289 0.54 0.8657
TINN [ms] 11.7354 12.14 22.0286 19.15 − 23.0000 24.0000 1.7424 1.80 21.9612
PC SD1 [ms] 2.5147 17.15 3.2191 18.33 − 2.4170 5.9416 1.7116 11.67 2.7266
PC SD2 [ms] 1.5550 6.94 3.4167 12.79 − 4.1039 2.3250 − 0.4611 − 2.06 3.3857
PC SD2/SD1 [–] 0.3073 18.78 0.4471 25.68 − 0.9732 0.0776 − 0.2867 − 17.52 0.3430
ApEn [–] 0.0496 4.47 0.0735 6.59 − 0.1008 0.0899 − 0.0060 − 0.54 0.0733
SampEn [–] 0.1552 8.25 0.2013 10.63 − 0.2462 0.3681 0.0634 3.37 0.1910
DFA α1 [–] 0.1502 16.99 0.2044 21.83 − 0.4356 0.1098 − 0.1164 − 13.16 0.1680
DFA α2 [–] 0.0594 13.29 0.0860 17.86 − 0.1801 0.0303 − 0.0497 − 11.12 0.0702
VLF PF [mHz] 1.5315 4.47 3.7685 10.87 − 6.6667 6.6667 0.0508 0.15 3.7684
LF PF [mHz] 9.1981 15.40 20.6890 32.38 − 23.3333 40.0000 2.5509 4.27 20.5326
HF PF [mHz] 16.7561 6.44 39.6176 14.86 − 36.6667 63.3333 3.3309 1.28 39.4802
VLF Abs. [ms2] 13.2536 19.35 36.9939 25.97 − 51.4332 5.0578 − 10.4884 − 15.31 35.4786
LF Abs. [ms2] 33.9061 15.82 208.0664 42.14 − 103.4176 31.8021 − 20.5115 − 9.57 207.0681
HF Abs. [ms2] 35.8349 18.55 63.0736 18.18 − 83.6440 68.3491 4.8635 2.52 62.8905
VLF Log. [log] 0.2509 7.80 0.4562 12.85 − 0.6521 0.2926 − 0.1318 − 4.16 0.4368
LF Log. [log] 0.2038 4.63 0.4208 9.07 − 0.4128 0.4864 0.0082 0.19 0.4208
HF Log. [log] 0.3819 8.56 0.6216 13.35 − 0.3093 1.1854 0.2692 6.04 0.5603
VLF Rel. [%] 3.4880 23.93 5.4798 29.68 − 12.0000 1.9409 − 2.8145 − 19.31 4.7021
LF Rel. [%] 6.0661 14.95 8.8321 20.03 − 18.4170 7.4994 − 3.2157 − 7.92 8.2265
HF Rel. [%] 8.2323 18.36 11.8936 23.76 − 6.6075 25.5536 6.0302 13.45 10.2524
LF Norm. [n.u.] 8.1777 16.70 11.8355 22.05 − 25.3497 7.2359 − 5.6440 − 11.52 10.4039
HF Norm. [n.u.] 8.1777 16.03 11.8355 21.31 − 7.2359 25.3497 5.6440 11.06 10.4039
LF/HF [n.u.] 0.5818 35.95 1.1213 44.10 − 2.5853 0.2765 − 0.4846 − 29.95 1.0112
PNS Indx [–] 0.1518 19.70 0.1935 20.00 − 0.1014 0.3836 0.1209 − 34.93 0.1512
SNS Indx [–] 0.3924 20.50 0.6327 25.28 − 1.3293 0.3248 − 0.2798 − 16.47 0.5675
Mean [%] 12.92 17.60 − 2.72
Median [%] 12.74 18.26 0.14