Validation of the Chinese version of the

Table 4 ROC analysis of section1 for BPD, BPDII and BPDI

	AUC	P	Cut-off	1	2	3	4	5	6	7	8	9	10	11	12
BPD	0.803	< 0.001	sen	0.98	0.93	0.85	0.72	0.59	0.42	0.35	0.26	0.19	0.14	0.06	0.02
			spe	0.15	0.36	0.55	0.73	0.86	0.90	0.94	0.97	0.99	1.00	1.00	1.00
BPDII	0.794	< 0.001	sen	0.99	0.94	0.84	0.70	0.55	0.43	0.31	0.20	0.13	0.09	0.05	0.03
			spe	0.15	0.36	0.55	0.73	0.86	0.90	0.94	0.97	0.99	1.00	1.00	1.00
BPDI	0.826	< 0.001	sen	0.95	0.90	0.88	0.78	0.67	0.58	0.50	0.43	0.33	0.25	0.13	0.00
			spe	0.15	0.36	0.55	0.73	0.86	0.90	0.94	0.97	0.99	1.00	1.00	1.00

a. sen = sensibility, spe = specificity
b. The sensibility and specificity were calculated by linear interlocation based on the sensibility and specificity of the corresponding cut-off on ROC
c. the sensibility and specificity in boldface maximized the Youden's index and the corresponding cut-off was considered the optimal one