The Body Roundness Index (BRI) is based on an ellipse with the major axis a person's height and the minor axis the waist. As a person becomes more obese the person appears to be more round. The authors are from Montclair State University (New Jersey), Christian-Albrechts University, St. Luke's-Roosevelt Hospital and Pennington Biomedical Research Center in Baton Rouge.
Parameters:
(1) height in centimeters
(2) waist circumference in centimeters
body roundness index =
= 364.2 - (365.5 * (eccentricity))
eccentricity =
= c/a
c = SQRT((a^2) - (b^2))
a = (height)/2
b = (waist) / (2 * PI()) = radius of a circle around the waist