<prompt> All of the following statements regarding prevalence are true except-It is rateIt is propoionDuration of disease effects prevalenceNumerator is a pa of denominator  <response>: Ref:Parks 23rd edition pg 61. Prevalence is a propoion with numerator being a pa of denominator. Prevalence refers specifically to all current cases old and new existing at a given point in time, or over a period of time in a given population. 