Table 3.

Diagnostic accuracy measures for different cutoff points of the predicted probabilities for a combination of TREC and KREC in “Antibody PID” diagnosis.

Cutoff point (probability)	PPV (%)	NPV (%)	Sensitivity (%)	Specificity (%)	Youden index
0.35	46	75	98	4	2.5
0.4	46	64	93	11	3.6
0.45	47	56	61	42	2.5
0.5	57	56	14	91	5.2
0.55	42	54	4	95	0
0.6	50	55	2	99	0.3

Optimum cut-off point based on maximum value of the J index is presented in bold.