Comparison of body adiposity index (BAI) and bmi with estimations of % body fat in clinically severe obese women1. (17th April 2013)

• Record Type: Journal Article
• Authors: Geliebter, Allan; Atalayer, Deniz; Flancbaum, Louis; Gibson, Charlisa D.
• Is Part Of: Obesity. Volume 21:Number 3(2013:Mar.)
• Page Start: 493
• Page End: 498
• Publication Date: 2013-04-17
• Subjects: Obesity -- Periodicals; 616.398005
• DOI: 10.1002/oby.20264
• Languages: English
• ISSNs: 1930-7381

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <sec id="abs1-1" sec-type="section"> <title>Objective:</title> <p>Body adiposity index (BAI), a new surrogate measure of body fat (hip circumference/(height<sup>1.5</sup> – 18)), has been proposed as an alternative to body mass index (BMI). We compared BAI with BMI, and each of them with laboratory measures of body fat‐derived from bioimpedance analysis (<italic>BIA</italic>), air displacement plethysmography (ADP), and dual‐energy X‐ray absorptiometry (DXA) in clinically severe obese (CSO) participants.</p> </sec> <sec id="abs1-2" sec-type="section"> <title>Design and Methods:</title> <p>Nineteen prebariatric surgery CSO, nondiabetic women were recruited (age = 32.6 ± 7.7 SD; BMI = 46.5 ± 9.0 kg/m<sup>2</sup>). Anthropometrics and body fat percentage (% fat) were determined from <italic>BIA</italic>, ADP, and DXA. Scatter plots with lines of equality and Bland–Altman plots were used to compare BAI and BMI with % fat derived from <italic>BIA</italic>, ADP, and DXA. BAI and BMI correlated highly with each other (<italic>r</italic> = 0.90, <italic>P</italic> < 0.001).</p> </sec> <sec id="abs1-3" sec-type="section"> <title>Results:</title> <p>Both BAI and BMI correlated significantly with % fat from <italic>BIA</italic> and ADP. BAI, however, did not correlate significantly with % fat from DXA (<italic>r</italic> = 0.42, <italic>P</italic> = 0.08) whereas BMI did (<italic>r</italic> = 0.65, <italic>P</italic> = 0.003). BMI was also the single best predictor of % fat from both <italic>BIA</italic> (<italic>r</italic><sup>2</sup> = 0.80, <italic>P</italic> < 0.001) and ADP (<italic>r</italic><sup>2</sup> = 0.65, <italic>P</italic> < 0.001). The regression analysis showed that the standard error of the estimate (SEE), or residual error around the regression lines, was greater for BAI comparisons than for BMI comparisons with <italic>BIA</italic>, ADP, and DXA. Consistent with this, the Bland and Altman plots indicated wider 95% confidence intervals for BAI difference comparisons than for BMI difference comparisons for their respective means for <italic>BIA</italic>, ADP, and DXA.</p> </sec> <sec id="abs1-4" sec-type="section"> <title>Conclusions:</title> <p>Thus, BAI does not appear to be an appropriate proxy for BMI in CSO women.</p> </sec> </abstract>