Scaling of adult body weight to height across sex and race/ethnic groups: relevance to BMI
Open Access
- 1 December 2014
- journal article
- Published by Elsevier BV in The American Journal of Clinical Nutrition
- Vol. 100 (6), 1455-1461
- https://doi.org/10.3945/ajcn.114.088831
Abstract
Background: Body mass index (BMI) is formulated on the assumption that body weight (BW) scales to height with a power of 2 (BW∝height2), independent of sex and race-ethnicity. Powers differing from 2 are observed in studies of selected samples, thus raising the question if BMI is a generalizable metric that makes BW independent of height across populations. Objectives: The objectives were to test the hypothesis that adult BW scales to height with a power of 2 independent of sex and race-ethnicity and to advance an understanding of BMI as a measure of shape by extending allometric analyses to waist circumference (WC). Design: We conducted cross-sectional subject evaluations, including body composition, from the NHANES and the Korean NHANES (KNHANES). Variations of the allometric model (Y = αXβ) were used to establish height scaling powers (β ± SE) across non-Hispanic white and black, Mexican American, and Korean men and women. Results: Exploratory analyses in population samples established age and adiposity as important independent determinants of height scaling powers (i.e., β). After age and adiposity in the next series of analyses were controlled for, BW scaling powers were nonsignificantly different between race/ethnic groups within each sex group; WC findings were similar in women, whereas small but significant between-race differences were observed in the men. Sex differences in β values were nonsignificant except for BW in non-Hispanic blacks and WC in Koreans (P < 0.05). Nationally representative powers for BW were (NHANES/KNHANES) 2.12 ± 0.05/2.11 ± 0.06 for men and 2.02 ± 0.04/1.99 ± 0.06 for women and for WC were 0.66 ± 0.03/0.67 ± 0.05 for men and 0.61 ± 0.04/0.56 ± 0.05 for women. Conclusions: Adult BW scales to height with a power of ∼2 across the 8 sex and race/ethnic groups, an observation that makes BMI a generalizable height-independent measure of shape across most populations. WC also follows generalizable scaling rules, a finding that has implications for defining body shape in populations who differ in stature.This publication has 34 references indexed in Scilit:
- Greater Abdominal Fat Accumulation Is Associated with Higher Metabolic Risk in Chinese than in White People: An Ethnicity StudyPLOS ONE, 2013
- Informativeness of indices of blood pressure, obesity and serum lipids in relation to ischaemic heart disease mortality: the HUNT-II studyEuropean Journal of Epidemiology, 2011
- Body-Mass Index and Mortality among 1.46 Million White AdultsThe New England Journal of Medicine, 2010
- Multiple imputation of missing dual‐energy X‐ray absorptiometry data in the National Health and Nutrition Examination SurveyStatistics in Medicine, 2010
- The Predictive Value of Different Measures of Obesity for Incident Cardiovascular Events and MortalityJournal of Clinical Endocrinology & Metabolism, 2010
- Dual Energy X-Ray Absorptiometry Body Composition Reference Values from NHANESPLOS ONE, 2009
- Body circumferences: clinical implications emerging from a new geometric modelNutrition & Metabolism, 2008
- Accuracy of body mass index in diagnosing obesity in the adult general populationInternational Journal of Obesity, 2008
- Indices of relative weight and obesityJournal of Chronic Diseases, 1972
- Some mathematical properties of weight-for-height indices used as measures of adiposity.Journal of Epidemiology and Community Health, 1971