Relationship Between Body Mass Index (BMI) and Adipose Tissue Volume. Panels A and B show representative computed tomographic scans in a case (A) and matched control (B) with BMI of 28.6 and 31.9 kg/m2, respectively. Boundaries 1, 2, and 3 (described in the text) are shown with thickened white lines to facilitate review. Visceral adipose tissue (filled circles, panel A) and subcutaneous adipose tissue (stars, panel B) are indicated. While the BMI was greater in the control, there was much more visceral fat in the case. Panels C and D show the relationships between BMI, visceral fat, and subcutaneous fat in cases and controls. Spearman correlation coefficients for case-control differences in BMI versus corresponding differences in visceral and subcutaneous fat were 0.72 (P<.001) and 0.78 (P<.001).