Table 3 False-positive results a in settings of varying prevalence and tests of varying specificity
From: Implications of the impact of prevalence on test thresholds and outcomes: lessons from tuberculosis
Disease prevalence rate | Number of false-positive results | |||
|---|---|---|---|---|
Specificity | ||||
90 % | 95% | 98% | 99% | |
20% | 80 | 40 | 16 | 8 |
40% | 60 | 30 | 12 | 6 |
60% | 40 | 20 | 8 | 4 |
80% | 20 | 10 | 4 | 2 |