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. 2012 Oct 10;5:563. doi: 10.1186/1756-0500-5-563

Table 3.

False-positive resultsa in settings of varying prevalence and tests of varying specificity

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

a Predicted numbers based on a hypothetical population of 1,000 tested individuals.