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

Table 3 Sensitivity, Specificity, and Predictive Value of ROC area of the HRV indices to assess the presence of CAD

Variable/Cutoff	Sens	Sp	PPV	NPV	Area under ROC curve	p	Odds Ratio (IC 95%)
HF ≤ 65 (ms ² )	58%	81%	49%	39%	0.708	0.0037	5.90 (1.7-20.53)
RMSSD ≤ 24.55 (ms)	70%	67%	81%	52%	0.667	0.0076	4.62 (1.51-14.1)
NN50 ≤ 15.54 (count)	51%	81%	85%	45%	0.653	0.0164	4.45 (1.16-20.7)
-ApEn ≤ 0.296	40%	90%	89%	42%	0.666	0.0188	6.21 (1.28-30.17)

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