Measures of disease frequency
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A very common aim of epidemiological investigation is to estimate the levels of disease in a population. This is of particular importance in the case of surveillance and disease monitoring systems, and is commonly the central aim of many descriptive studies. There are two main measures of disease frequency - the prevalence and the incidence of disease, which each measure different aspects of disease. The time to event is another measure commonly used, and is closely related to the incidence.