The number of cases that exist in a given population
When calculating prevalence, the scale of measurement of the outcome dictates what statistic is used. If the outcome is categorical, then frequency statistics are used to establish the percentage (%) of the sample (population) that possesses the outcome of interest. With ordinal outcomes, researchers report medians and interquartile ranges as a measure of prevalence. Finally, for continuous outcomes, means and standard deviations are used to describe prevalence.
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