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body roundness index

Indications: - may be measure of obesity that predicts mortality better than BMI Procedure: - Body Roundness Index = 364.2 - 365.5 Eccentricity* [1] * Eccentricity quantifies the degree of circularity of an ellipse [1] - its values range between 0 to 1 - 0 is a perfect circle, 1 a vertical line - BRI combines waist circumference & height to describe body shape [2] - BRI in ref [1] ranged from 1-16 - eccentricity is defined as square root of (1 - [waist circumference in cm/2 x pi]*2 / [0.5 x height in cm]*2), where *2 is squared [2] Interpretation: - larger values of BRI are associated with rounder individuals - values closer to 1 are related to more narrowly shaped lean individuals

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References

  1. Thomas DM, Bredlau C, Bosy-Westphal A et al Relationships between body roundness with body fat and visceral adipose tissue emerging from a new geometrical model. Obesity (Silver Spring). 2013 Nov;21(11):2264-71. PMID: 23519954 PMCID: PMC3692604 Free PMC article.
  2. Zhang X, Ma N, Lin Q et al Body Roundness Index and All-Cause Mortality Among US Adults. JAMA Netw Open. 2024;7(6):e2415051. PMID: 38837158 PMCID: PMC11154161 Free PMC article. https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2819558
  3. Yang M, Liu J, Shen Q et al Body Roundness Index Trajectories and the Incidence of Cardiovascular Disease: Evidence From the China Health and Retirement Longitudinal Study J Am Heart Assoc. 2024 Sep 25:e034768 PMID: 39319466 https://www.ahajournals.org/doi/10.1161/JAHA.124.034768