Table 6.

Sensitivity and Specificity of each frailty score in predicting all-cause mortality of HD patients

Criterion	sensitivity	95%CI	specificity	95%CI	Youden index
0	100.00	83.2-100.0	0.00	0.0-7.5	0
1	100.00	83.2-100.0	2.13	0.05-11.3	0.0213
2	95.00	75.1-99.9	27.66	15.6-42.6	0.2266
3	90.00	68.3-98.8	44.68	30.2-59.9	0.3468
4	70.00	45.7-88.1	82.98	69.2-92.4	0.5298
5	40.00	19.1-69.3	95.74	85.5-99.5	0.3574

Abbreviations: 95%CI, 95%confidential interval.

Notes: AUC of ROC curve is 0.819 (95% CI 0.708-0.902) (P < 0.001).

Value of Youden index = value of sensitivity+ value of specificity-100.