<prompt> Calculate the prevalence if incidence is 2 cases per 1000 population oer 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>: the relationship between incidence and prevalence can be calculated as,prevalence incidencemean duration ,here in this case it equals 24 that is 8 cases per 1000 population. ref:park;s textbook of preventive and social medicine,22nd edition,pg no 58 