Table 2. The diagnostic performance of the validation cohort in Zhengzhou and Nanchang.

	AUC (95% CI)	P	Se (%) (95% CI)	Sp (%) (95% CI)	PPV (%)	NPV (%)	Accuracy (%)
Zhengzhou	0.733 [0.642–0.082]	<0.0001	28.1 [18.1–40.8]	93.0 [83.3–97.2]	80.0	56.4	60.5
Nanchang	0.745 [0.614–0.876]	0.0017	39.3 [23.6–57.6]	89.3 [72.8–96.3]	78.6	59.5	64.3

Note:

Cut off: 0.351 was determined by the 90% percentile of Nanchang NC. Se, sensitivity; Sp, specificity; PPV, positive predictive value; NPV, negative predictive value.