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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