number needed to screen

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The number of people who must be given a screening procedure to detect a case of the specified condition for which the screening procedure is conducted. The number varies widely according to the prevalence of the condition and whether the screening procedure is conducted in a general or a previously selected high-risk population subsample. The number can be calculated from available data on the incidence or prevalence of the condition.

Subjects: Public Health and Epidemiology.

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