True about PPV is: (A) Increases with prevalence, (B) Decreases with prevalence, (C) No relation with prevalence, (D) Accuracy
Answer is A. The predictive value of a positive test indicates the probability that a patient with a positive test result does indeed have the disease in question. The more prevalent a disease, the more accurate will be the predictive value of a positive screening test. Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 153