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Fig. 2A —Graphs of attenuation against contrast medium iodine mass per body weight index with 95% CI fit to regression lines. Plots of aortic (A) and hepatic (B) attenuation against contrast medium iodine mass per body weight index show moderately strong correlations existed between index and aortic (Spearman's rho [r_s] = 0.60 [95% CI, 0.45–0.72], p < 0.001) and hepatic (r_s = 0.60 [0.42–0.70], p < 0.001) attenuations. Regression formulae are aortic attenuation = 58.4 + 176.3 x contrast medium iodine mass per body weight index (p < 0.001), and hepatic attenuation = 58.7 + 108.5 x contrast medium iodine mass per body weight index (p < 0.001).