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

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

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

Sens = sensitivity, Sp = specificity, PPV = positive predictive value, NPV = negative predictive value.