<prompt> True statement about PPV is:It increases with prevalenceIt decreases with prevalenceNo relation with prevalenceIncreases incidence  <response>: Ans. a It increases with prevalenceRef: K. Park 23rd ed. 140-141 POSITIVE PREDICTIVE VALUE Ability of screening test to identify correctly all those who have disease out of all those who test positive on a screening test. It depends upon sensitivity, specificity and prevalence of a disease in a population PPV of a screening is directly proportional to prevalence of disease If Prevalence of a disease increases in a population, PPV increase for the screening test.PPVTPTPFP x 100 