ASK 4 Prevalence vs incidence A study starts with 5000 people. Of those, 300 currently have CVD. Calculate the prevalence per 1000 people Prevalence = # of cases / # of people in the population = ...... x [per number of people] Over the next 2 years, 80 more people in that study develop CVD. What is the incidence? What is the incidence rate of disease over the study period? (assuming no-one dies over that period) Incidence = # of new cases / # of years = ..... Per year Incidence rate = # of new cases / (# of people at risk x # of years) = ........ / year (x1000 = .... Per 1000 person-years)