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Fig. 8 —Plot of aortic attenuation (H) versus body surface area (BSA) (m²) with bivariate fit of low- and high-body mass index (BMI) groups. Regression formulas of aortic attenuation versus BSA were aortic attenuation (H) = 706–187 BSA (m²) (p < 0.001) for low-BMI group (+, solid fitting line) and aortic attenuation (H) = 627–151.0 BSA (m²) (p < 0.001) for high-BMI group (o, dotted fitting line). Note that these two regression lines are more closely approximated than two regression lines in Figure 7. This suggests that discrepancy between high- and low-BMI groups in decline rate of aortic attenuation was less pronounced with BSA than with body weight.