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