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Table 3 Number of ECG time segments for which the standardized difference between Actiheart and Holter HRV estimates (in units of repeatability standard deviations, z) exceeds 1 and 2, respectively

From: Comparison of two systems for long-term heart rate variability monitoring in free-living conditions - a pilot study

HRV metric s(repeatability) Number of segments z>1 Percentage of totala Number of segments z>2 Percentage of totala
ln(TP) 0.41 19 3.9% 4 0.8%
ln(LFP) 0.39 28 5.7% 10 2.0%
ln(HFP) 0.50 37 7.6% 12 2.5%
ln(LF/HF) 0.41 47 9.6% 12 2.5%
LFn.u. 0.078 39 8.0% 12 2.5%
HFn.u. 0.078 32 6.5% 8 1.6%
  1. a Total n = 489 ECG segments