Table 4. Areas under the ROC curve, cut offs, sensitivity, specificity, PPV, NPV and Youden index of baPWV by age groups.

Age	AUC (%) (95%CI)	P	Cut-off point	Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)	Youden index
40–50 (yrs)	75.30 (67.48–83.35)	0.001	1355	75.55	66.29	42.76	89.05	0.42
50–60 (yrs)	63.35 (58.96–67.60)	0.001	1427	68.35	53.28	32.78	83.47	0.22
>60 (yrs)	55.37 (51.19–60.01)	0.018	1680	65.33	48.87	30.03	80.87	0.14
Total	62.50 (60.00–65.30)	0.001	1435	76.06	50.43	33.84	86.34	0.26

Abbreviations: AUC, areas under the ROC curve; PPV, positive predictive value; NPV, negative predictive value.