<prompt> Calculate the prevalence if incidence is 2 cases per 1000 population per year and mean duration is 4 years -8 Cases per 1000 population2 Cases per 1000 population0.5 Cases per 1000 population32 Cases per 1000 population  <response>: Ans. is a i.e., 8 Cases per 100 population o Prevalence 2 x 4 8 Causes per 1000 populations 