Both prevalence and incidence are epidemiological measures showing information about disease in the population. This allows for evaluation of how often and in which people diseases occur, and planning for allocation of resources for the future., Incidence is the rate of new cases or events over a specified period for the population at risk for the event. In medicine, the incidence is commonly the newly identified cases of a disease or condition per population at risk over a specified timeframe.[1], It presents statistics in four overarching areas: health status and determinants, health care utilization, health care resources, and health expenditures and payers., Incidence, in epidemiology, occurrence of new cases of disease, injury, or other medical conditions over a specified time period, typically calculated as a rate or proportion. Examples of incident cases or events include a person developing diabetes, becoming infected with HIV, starting to smoke,, "Incidence" means the number of people who are newly diagnosed with a condition, while "prevalence" of that condition includes newly diagnosed people, plus people who were diagnosed in the past, and, if the information is obtainable, people who haven't been diagnosed., At their most basic level, incidence and prevalence differ in how they deal with the timing of cases — as well as how that timing influences the collection and dissemination of data. Incidence focuses on new cases, while prevalence deals with total cases (including those thought to be new)..