If prevalence of a disease increases, what is true-: (A) PPV increases, (B) PPV decreases, (C) No effect on PPV, (D) Prevalence is more in A
Answer is A. Ref:Parks 25th edition pg 153. Positive predictive value depends on prevalence : Note : PPV increases as prevalence increases. PPV decreases as prevalence decreases. But sensitivity and specificity is independent of prevalence.