Body adiposity index performance in estimating body fat percentage in colombian college students: findings from the FUPRECOL—adults study

Abstract

Recently, a body adiposity index (BAI = (hip circumference)/((height)(1.5))􀀀18) was developed and validated in adult populations. The aim of this study was to evaluate the performance of BAI in estimating percentage body fat (BF%) in a sample of Colombian collegiate young adults. The participants were comprised of 903 volunteers (52% females, mean age = 21.4 years 3.3). We used the Lin’s concordance correlation coefficient, linear regression, Bland–Altman’s agreement analysis, concordance correlation coefficient (rc) and the coefficient of determination (R2) between BAI, and BF%; by bioelectrical impedance analysis (BIA)). The correlation between the two methods of estimating BF% was R2 = 0.384, p < 0.001. A paired-sample t-test showed a difference between the methods (BIA BF% = 16.2 3.1, BAI BF% = 30.0 5.4%; p < 0.001). For BIA, bias value was 6.0 6.2 BF% (95% confidence interval (CI) = 􀀀6.0 to 18.2), indicating that the BAI method overestimated BF% relative to the reference method. Lin’s concordance correlation coefficient was poor (rc = 0.014, 95% CI = 􀀀0.124 to 0.135; p = 0.414). In Colombian college students, there was poor agreement between BAI- and BIA-based estimates of BF%, and so BAI is not accurate in people with low or high body fat percentage levels.