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Table 2 HRV indices in no CAD and CAD groups

From: Sensitivity, specificity and predictive values of linear and nonlinear indices of heart rate variability in stable angina patients

Index No DAC (n = 21) DAC (n=43) p
RR (ms) 896±136 914±139 0.6191
SDNN (ms) 39.71±18.7 29.95±13.6 0.0209 *
RMSSD (ms) 32.38±18.1 22.99±11.9 0.0303 **
NN50 (count) 135.48±146.28 59.42±80.9 0.0476 **
VLF (ms 2 ) 323.67±420.49 220.56±242.8 0.2058
LF (ms 2 ) 332.48±420.78 179.12±175.08 0.0641
HF (ms 2 ) 233.10±241.7 87.72±81.04 0.0073 **
SD1 (ms) 23.21±12.9 16.52±16.52 0.0282 *
SD2 (ms) 67.19±25.9 52.75±25.6 0.0387 *
SD1/SD2 0.33±0.1 0.34±0.1 0.6269
α1 0.93±0.2 1±0.3 0.2189
α2 0.9±0.2 0.91±0.1 0.5577
Lyapunov exponent (LE) 0.91±0.1 0.89±0.1 0.4416
Hurst exponent (HE) 0.21±0.1 0.22±0.1 0.6294
-ApEn 0.388±0.09 0.343±0.08 0.0368 **
  1. * = p <0.05 with area under ROC curve < 0.65; ** = p <0.05 with area under ROC curve ≥ 0.65.