A test has a high false positive rate in a community. True is: (A) High prevalence, (B) Low prevalence, (C) High sensitivity, (D) High specificity
Answer is B. The propoion of false-positive results among those who test positive is 1 minus the positive predictive value. False positive (discovery) rate = 1- positive predictive valueAs the disease prevalence increases, the positive predictive value increases. (PPV)As prevalence increase, PPV increase, False positive rate decrease.