Table 3.

Positive and negative predictive values (PPV, NPV] for the cut-offs of 25 and 21 on the M-ACE at different prevalence rates

Cut-off	Prevalence
	5%		10%		20%		40%		60%		80%
	PPV	NPV	PPV	NPV	PPV	NPV	PPV	NPV	PPV	NPV	PPV	NPV
25	0.26	0.99	0.42	0.98	0.73	0.93	0.81	0.89	0.90	0.79	0.96	0.59
21	1.00	0.97	1.00	0.96	1.00	0.91	1.00	0.79	1.00	0.63	1.00	0.39

A typical memory clinic would have a prevalence of at least 50%.