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Table 2 MHR variability indices, obtained with ECG and PPG in H1 and H2, presented as 95 % confidence intervals (95 % CI), with the corresponding p-values and correlation coefficient

From: Electrocardiography versus photoplethysmography in assessment of maternal heart rate variability during labor

  H1 H2 H1 vs H2
95 % CI p r 95 % CI p r p
ECG PPG ECG PPG ECG PPG
mHR 83.09–85.59 83.19–85.64 0.002 1.00 86.29–93.13 86.64–93.32 0.016 0.99 0.000 0.001
sdHR 5.99–6.55 4.35–5.11 0.000 0.90 6.66–7.97 5.11–5.99 0.000 0.92 0.000 0.000
LTI 10.53–11.67 8.13–9.19 0.000 0.92 12.37–14.33 9.19–11.31 0.000 0.90 0.000 0.000
Delta 21.42–23.33 10.16–11.44 0.000 0.71 24.19–27.13 11.30–13.78 0.000 0.81 0.000 0.000
STV 3.53–3.89 0.94–1.03 0.000 0.60 3.85–4.41 1.05–1.18 0.000 0.71 0.001 0.000
II 0.56–0.63 0.19–0.21 0.000 0.74 0.55–0.60 0.18–0.21 0.000 0.72 0.177 0.573
TP 25.82–30.27 11.42–14.32 0.000 0.83 33.50–44.59 14.05–21.23 0.000 0.89 0.000 0.000
VLF 8.53–10.57 7.53–9.49 0.000 0.95 11.13–15.57 8.88–13.56 0.000 0.94 0.000 0.001
LF 6.67–8.12 3.20–4.01 0.000 0.88 8.16–10.87 4.14–5.47 0.000 0.90 0.000 0.000
LFnorm 45.28–50.38 90.90–92.56 0.000 0.44 43.29–49.99 91.69–92.76 0.000 0.41 0.926 0.643
HF 4.70–5.61 0.16–0.20 0.000 0.71 5.90–7.69 0.21–0.27 0.000 0.73 0.000 0.000
HFnorm 28.33–32.18 4.70–5.49 0.000 0.45 28.03–32.48 4.66–5.55 0.000 0.45 0.805 0.958
LF/HF 1.47–1.69 16.67–19.56 0.000 0.48 1.35–1.67 16.48–19.73 0.000 0.46 0.944 0.981
ApEn (2,0.1) 1.21–1.24 0.55–0.60 0.000 0.23 1.16–1.21 0.57–0.61 0.000 0.22 0.010 0.276
ApEn (2,0.15) 1.15–1.20 0.52–0.56 0.000 0.43 1.10–1.15 0.48–0.56 0.000 0.47 0.023 0.371
ApEn (2,0.2) 0.98–1.04 0.26–0.45 0.000 0.51 0.96–1.02 0.24–0.34 0.000 0.53 0.163 0.620
SampEn (2,0.1) 1.52–1.62 0.38–0.45 0.000 0.38 1.41–1.54 0.40–0.46 0.000 0.59 0.039 0.524
SampEn (2,0.15) 1.16–1.29 0.33–0.39 0.000 0.38 1.06–1.16 0.31–0.38 0.000 0.46 0.001 0.336
SampEn (2,0.2) 0.91–0.99 0.20–0.28 0.000 0.51 0.87–0.96 0.18–0.22 0.000 0.58 0.062 0.479
rLu 0.13–0.13 0.06–0.06 0.000 0.48 0.12–0.13 0.06–0.06 0.000 0.36 0.074 0.286
ApEn (2,rLu) 1.20–1.24 0.57–0.61 0.000 0.18 1.15–1.21 0.60–0.63 0.000 0.12 0.007 0.003
SampEn (2,rLu) 1.33–1.39 0.40–0.46 0.000 0.08 1.22–1.32 0.43–0.49 0.000 0.07 0.000 0.052
SD1 1.57–1.74 0.37–0.39 0.000 0.47 1.68–2.17 0.40–0.46 0.000 0.44 0.004 0.000
SD2 8.21–9.06 6.13–7.22 0.000 0.91 9.17–10.94 7.21–8.46 0.000 0.93 0.000 0.000
SD1/SD2 0.19–0.21 0.06–0.06 0.000 0.48 0.17–0.19 0.05–0.06 0.000 0.36 0.078 0.308
  1. The last two columns display the p-values of the comparison between H1 and H2
  2. p-values <0.05 are in italics
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