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Here are five differences between incidence and prevalence in a table format:
incidence and prevalence
| Difference | Incidence | Prevalence |
|---|---|---|
| Definition | The number of new cases of a disease in a population over a specific period of time | The total number of cases of a disease in a population at a specific point in time |
| Calculation | Number of new cases / size of population at risk x time period | Total number of cases / size of population at risk |
| Time frame | Typically measured over a defined time period, such as a year | Measured at a specific point in time or over a longer period |
| Focus | Focuses on new cases and risk of developing a disease | Focuses on existing cases of a disease |
| Used for | Used to understand the risk of developing a disease in a population and to identify risk factors | Used to understand the overall burden of disease in a population and to evaluate the effectiveness of prevention and treatment programs |
