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Fig. 7 —Plot of aortic attenuation (H) versus body weight (kg) with bivariate fits for low- and high-body mass index (BMI) groups. Regression formula of aortic attenuation versus body weight was aortic attenuation (H) = 586–3.1 weight (kg) (p < 0.001) for low-BMI group (+, solid fitting line) and aortic attenuation (H) = 485–1.9 weight (kg) (p < 0.001) for high-BMI group (o, dotted fitting line). Regression slope (H/kg) of high-BMI group (1.9 [2.6–1.1, 95% CI]) was less steep than that for low-BMI group (3.1 [4.4–1.8]), but 95% CIs overlap. So that regression lines can be better seen, 95% CIs are not included in figure.