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Proportions are also useful measures of morbidity and mortality. They have different characteristics than rates and ratios. In a proportion, the numerator represents the number of events that meet a set of criteria, like that of a ratio. However, the denominator represents the maximum number of events that could meet these criteria. Like a rate, the numerator and denominator of a proportion are related. By definition, the range of a proportion is between 0.0 and 1.0 (or 0% and 100%). The general formula for calculating proportions is shown on slide 27.