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Proportion type of ratio in which numerator is part of denominator. = A/(A+B) x 100 Ratio value obtained by dividing one quantity by another. consists of numerator and denominator, but does not necessarily have relationship Rate numerator consists of the frequency of disease over specified period of time, denominator is unit size of population at specific point in time Prevalence number of existing cases of disease in a population at designated time Incidence rate of development of a disease in a group over a certain time period