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Table 4 Sensitivity, Specificity, and Predictive Value of ROC area of the HRV indices to assess the presence of CAD according to the patients’ age

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

Variable/Cutoff Sens Sp PPV NPV Area under ROC curve
-ApEn ≤ 0.41 87% 47% 69% 73% 0.698
HF ≤ 198.19 (ms 2 ) 96% 41% 69% 88% 0.669
RMSSD ≤ 19.53 (ms) 61% 71% 74% 57% 0.642
NN50 ≤ 176.40 (count) 91% 41% 68% 78% 0.625
  1. Sens = sensitivity, Sp = specificity, PPV = positive predictive value, NPV = negative predictive value.