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Table 2 Heart rate variability parameters; frequency, linear and non-linear, across three different QRS groups

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

   QRS duration (ms)   p-value
80–100 (n = 115) >100–120 (n = 69) >120 (n = 16)
n Mean (SD) n Mean (SD) n Mean (SD)
Frequency domain, mean (SD)
 Total power (ms2) 102 1222.9 (781.7) 62 1302.4 (793.9) 14 1233.3 (591.7) 0.81
 HF (ms2) 92 192.2 (134.7) 59 181.7 (125.3) 14 2229.8 (145) 0.47
 LF (ms2) 95 264.9 (178) 62 300.4 (194.7) 15 312.6 (229.4) 0.42
 HF In 100 5.3 (1.1) 52 5.3 (1.0) 11 5.6 (0.8) 0.73
 LF In 99 5.6 (0.9) 52 5.7 (0.8) 11 5.9 (0.9) 0.59
 HF norm (v) 115 44.3 (18.2) 69 42.2 (18.1) 15 42.3 (23.0) 0.73
 LF norm (v) 115 55.1 (18.1) 68 58.1 (18.5) 16 51.5 (23.3) 0.37
 LF/HF ratio 101 1.3 (0.8) 60 1.5 (0.9) 13 1.2 (0.9) 0.36
Time domain, mean (SD)
 SDNN (ms) 108 38.9 (13.7) 65 38.9 (13.2) 14 38.7 (12) 1.00
 RMSDD (ms) 103 25.7 (10.4) 63 24.7 (10.3) 15 29.1 (11.8) 0.34
Nonlinear analysis
 DFA α1 115 1.0 (0.2) 69 1.1 (0.3) 16 1.1 (0.4) 0.43
 DFA α2 111 1.0 (0.2) 67 1.0 (0.2) 16 0.9 (0.2) 0.60
 DFA 32 0   0   0   
 ApEN 110 1.3 (0.2) 69 1.2 (0.2) 16 1.2 (0.2) 0.093
  1. SD standard deviation, 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