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Techniques and Methods

Optimal scaling of weight and waist circumference to height for maximal association with DXA-measured total body fat mass by sex, age and race/ethnicity

Abstract

BACKGROUND:

Body mass index (BMI; weight (Wt)/height (Ht) (in kg m−2) and waist circumference (WC) are widely used as proxy anthropometric measures for total adiposity. Little is known about what scaling power of ‘x’ in both Wt(kg)/Ht(m)x and WC(m)/Ht(m)x is maximally associated with measured total body fat mass (TBFM). Establishing values for x would provide the information needed to create optimum anthropometric surrogate measures of adiposity.

OBJECTIVE:

To estimate the value of ‘x’ that renders Wt/Htx and WC/Htx maximally associated with DXA-measured TBFM.

SUBJECTS:

Participants of the NHANES 1999–2004 surveys, stratified by sex (men, women), race/ethnicity (non-Hispanic whites, non-Hispanic blacks, Mexican-Americans), and age(18–29, 30–49, 50–84years).

METHODS:

We apply a grid search by increasing x from 0.0–3.0 by increments of 0.1 to the simple regression models, TBFM=b0+b1*(Wt/Htx) and TBFM=b0+b1*(WC/Htx) to obtain an estimate of x that results in the greatest R2, taking into account complex survey design features and multiply imputed data.

RESULTS:

R2’s for BMI are 0.86 for men (N=6544) and 0.92 for women (N=6362). The optimal powers x for weight are 1.0 (R2=0.90) for men and 0.8 (R2=0.96) for women. The optimal power x for WC is 0, that is, no scaling of WC to height, for men (R2=0.90) or women (R2=0.82). The optimal powers for weight across nine combinations of race/ethnicity and age groups for each sex vary slightly (x=0.8–1.3) whereas the optimal scaling powers for WC are all 0 for both sexes except for non-Hispanic black men aged 18–29y (x=0.1). Although the weight-for-height indices with optimal powers are not independent of height, they yield more accurate TBFM estimates than BMI.

CONCLUSION:

In reference to TBFM, Wt/Ht and Wt/Ht0.8 are the optimal weight-for-height indices for men and women, respectively, whereas WC alone, without Ht adjustment, is the optimal WC-for-height index for both sexes. Thus, BMI, an index independent of height, may be less useful when predicting TBFM.

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Acknowledgements

This study is supported in part by the Albert Einstein College of Medicine funds.

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Correspondence to M Heo.

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Heo, M., Kabat, G., Gallagher, D. et al. Optimal scaling of weight and waist circumference to height for maximal association with DXA-measured total body fat mass by sex, age and race/ethnicity. Int J Obes 37, 1154–1160 (2013). https://doi.org/10.1038/ijo.2012.201

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