TABLE 3.

Risk score analysis of in PD with different stages.

Score	0–4.55	4.55–8.91	PPVa	NPVb
Training set (n = 60)			0.95	0.97
PD (stage 2–5)	3	58
PD (stage 1)	57	2
Validation set (n = 240)			0.81	0.85
PD (stage 2–5)	45	205
PD (stage 1)	195	35

^aPPV, positive predictive value. ^bNPV, negative predictive value.