1 The upper portion of a fraction used to calculate a rate or ratio. 2 For a performance measure, the cases in the denominator group that experience events specified in a review criterion. See “denominator”.
1 The lower portion of a fraction used to calculate a rate or ratio. In a rate, the denominator is usually the population at risk. 2 For a performance measure, the sample of cases that will be observed (e.g. the number of patients discharged alive with a confirmed diagnosis of acute myocardial infarction, excluding patients with bleeding or other specified conditions). See “numerator”.... denominator
A quotient, with the number of cases of a specified disease diagnosed or reported during a stated period of time as the numerator, and the number of persons in the population in which they occurred as the denominator.... incidence rate
The halfway point or midpoint in a set of observations. For most types of data, it is calculated as the sum of the smallest observation and the largest observation, divided by two. For age data, one is added to the numerator. The midrange is usually calculated as an intermediate step in determining other measures.... midrange
quotient using as the numerator, the number of persons sick or portraying a certain condition, in a stated population, at a particular time, regardless of when that illness or condition began, and as the denominator, the number of persons in the population in which they occurred.... prevalence rate
A rate is the frequency with which a health event occurs in a defined population. The components of the rate are the numbers of deaths or cases (the numerator), the population at risk (denominator), and the specified time in which the events occurred. All rates are ratios, calculated by dividing the numerator by the denominator.... rate
The value obtained by dividing one quantity by another: a general term of which rate, proportion, percentage, etc. are subsets. A ratio is an expression of the relationship between a numerator and a denominator where the two usually are separate and distinct quantities, neither being included in the other.... ratio
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