Data are derived from the National Health Interview Survey and, for years prior to 1982, supplementary information from other survey sources and administrative records. The methods used to construct a comparable series spanning the entire period build on those in Cohen et al8 and Cohen9 and are described in detail in Council of Economic Advisers 2014.10 For years 1989 and later, data are annual. F
Estimated number of computed tomographic (CT) scans performed in the United States in 2007 (after exclusions), according to sex and age at exposure. The number of CT scans were estimated using the survey data for total number of scans of each type. *The age distribution of CT scans comes from the national commercial insurance database, excluding CT scans that had a diagnosis code of cancer or that
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