Table 3.
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%.