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Statistics and Human CommunicationStatistics are available on: Basics. The branch of medical science that investigates all the factors that determine the presence or absence of disease is called epidemiology. Epidemiologists study the incidence, or the number of new cases of a disease in a population over a period of time, and prevalence, the number of existing cases of a disease in a population at a given time. Cost-of-illness or burden-of-disease are two measures of the economic and social impact of diseases in a population. Challenges. Statistical and epidemiological data on diseases and disorders of human communication are limited.
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