Table 4. Discriminant validity of the Beijing version of the Montreal Cognitive Assessment and the Mini-Mental State Examination for detecting cognitive impairment.

MoCA					MMSE
Cutoff ≤	Sen	Spe	PPV	NPV	Cutoff ≤	Sen	Spe	PPV	NPV
20	0.345	0.983	0.988	0.261	20	0.101	1.000	1.000	0.208
21	0.492	0.983	0.992	0.313	21	0.111	1.000	1.000	0.210
22	0.657	0.880	0.959	0.377	22	0.169	1.000	1.000	0.221
23	0.806	0.803	0.946	0.495	23	0.234	1.00	1.000	0.235
24†	0.877	0.752	0.938	0.591	24	0.371	1.000	1.000	0.273
25	0.942	0.598	0.909	0.707	25	0.498	0.897	0.954	0.297
26	0.988	0.393	0.873	0.885	26†	0.704	0.769	0.928	0.380
27	1.000	0.222	0.845	1.000	27	0.792	0.701	0.918	0.443
28	1.000	0.103	0.825	1.000	28	0.869	0.470	0.874	0.458
29	1.000	0.103	0.825	1.000	29	0.946	0.299	0.851	0.565

Abbreviations: MoCA, Montreal Cognitive Assessment; MMSE, Mini-Mental State Examination; Sen, Sensitivity; Spe, Specificity; PPV, positive predictive value; NPV, negative predictive value.

† Optimal cutoff score determined using Youden’s index.