A screening test has 90% sensitivity and 90% specificity. Diseased population is 10% What is PPV ?: (A) PPV 80%, (B) PPV 85%, (C) PPV 90%, (D) PPV 95%
Answer is C. Sensitivity = 90%
Specificity = 90%
Prevalence = 10%
(i) Formula for PPV according to Bayes Theorem,