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Table 5 Linear regression analysis between SBP and HRV (both as continuous variables) - among “healthy” individuals (without diabetes, hypertension or self reported cardiovascular conditions)

From: Systolic blood pressure but not electrocardiogram QRS duration is associated with heart rate variability (HRV): a cross-sectional study in rural Australian non-diabetics

Heart rate variability   SBP
Univariate Multivariate (adjusted for age)
Coefficient (r) p-value Coefficient (r) p-value
Frequency domain, mean (SD)
 Total power (ms2) −0.001 0.59 −0.001 0.67
 HF (ms2) −0.02 0.05 −0.015 0.13
 LF (ms2) −0.01 0.28 −0.043 0.51
 HF In −2.65 0.017 −1.67 0.12
 LF In −1.06 0.42 0.15 0.91
 HF norm (v) −0.97 0.18 −0.085 0.23
 LF norm (v) 0.13 0.07 0.11 0.11
 LF/HF ratio 3.52 0.026 2.79 0.064
Time domain, mean (SD)
 SDNN (ms) −0.09 0.31 −0.029 0.74
 RMSDD (ms) −0.31 0.013 −0.23 0.051
Nonlinear analysis
 DFA α1 1.65 0.74 0.58 0.9
 DFA α2 7.11 0.37 0.55 0.94
 DFA32 −0.033 0.6 0.031 0.59
 ApEN −25.1 <0.001 −20.55 0.001
  1. HF high frequency, LF low frequency, norm normalized, SDNN standard deviation of R-R intervals, RMSDD root mean square of successive difference of RR, DFA detrended fluctuation analysis, ApEN approximate entropy