For most disease, prevalence rates change rapidly and are of great use for epidemiologic studies.

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Prevalence rates indicate how widespread a disease is within a population at a specific time point or over a specific period, and they change relatively slowly compared to incidence rates. Incidence rates, which measure the number of new cases over a period, are more useful for understanding the rapid changes in disease spread and are often more relevant for epidemiologic studies aimed at understanding risk factors and causes of diseases.

For Most Disease, Prevalence Rates Change Rapidly and Are of Great