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Fig. 1. —Graph shows proportion of total number of CT examinations performed on individuals younger than a given age. Data are from 1989 British study by Shrimpton et al. [5]. Ordinate on right shows estimated absolute numbers of CT examinations now performed annually in United States on patients younger than a given age (based on proportions from Shrimpton et al. [5], an overall annual frequency of CT examinations in the United States of 91/1000 [3], and current United States population of 274,000,000).

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