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Comparison of body adiposity index (BAI) and bmi with estimations of % body fat in clinically severe obese women

2013; Wiley; Volume: 21; Issue: 3 Linguagem: Inglês

10.1002/oby.20264

1930-739X

Allan Geliebter, Deniz Atalayer, Louis Flancbaum, Charlisa D. Gibson,

Lower Extremity Biomechanics and Pathologies

Abstract Objective: Body adiposity index (BAI), a new surrogate measure of body fat (hip circumference/(height 1.5 – 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 ( BIA ), air displacement plethysmography (ADP), and dual‐energy X‐ray absorptiometry (DXA) in clinically severe obese (CSO) participants. Design and Methods: Nineteen prebariatric surgery CSO, nondiabetic women were recruited (age = 32.6 ± 7.7 SD; BMI = 46.5 ± 9.0 kg/m 2 ). Anthropometrics and body fat percentage (% fat) were determined from BIA , ADP, and DXA. Scatter plots with lines of equality and Bland–Altman plots were used to compare BAI and BMI with % fat derived from BIA , ADP, and DXA. BAI and BMI correlated highly with each other ( r = 0.90, P < 0.001). Results: Both BAI and BMI correlated significantly with % fat from BIA and ADP. BAI, however, did not correlate significantly with % fat from DXA ( r = 0.42, P = 0.08) whereas BMI did ( r = 0.65, P = 0.003). BMI was also the single best predictor of % fat from both BIA ( r 2 = 0.80, P < 0.001) and ADP ( r 2 = 0.65, P < 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 BIA , 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 BIA , ADP, and DXA. Conclusions: Thus, BAI does not appear to be an appropriate proxy for BMI in CSO women.