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Projected relative risk as a function of age at (last) exposure, under nonuniform (top) and uniform (bottom) field conditions, for subjects with only 1 procedure and thus no cumulative radiation exposure caused by multiple procedures. Median projected risk was 1.2 (mean = 1.31, SD = 0.37; range, 1.0–3.48) for small nonuniform field condition and 2.03 (mean = 2.6, SD = 2; range, 1.02–15.32) for large uniform field conditions.
