Ruff and Jamison described the trunk frame size as a measure appropriate for comparing people with different body proportions. The authors are from the Johns Hopkins University and Indiana University.



(1) sitting height in cm

(2) bi-iliac breadth (as a measure of relative body breadth) in cm

(3) standing height (stature) in cm


relative sitting height =

= (sitting height in cm) / (stature in cm)


relative bi-iliac body breadth =

= (bi-iliac breadth in cm) / (stature in cm)


trunk frame size in square cm =

= (sitting height in cm) * (bi-iliac breadth in cm)


The authors felt that the trunk frame size may be more appropriate than stature for calculating body mass indices (see trunk frame index, above).


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