Validity of body adiposity index in predicting body fat in a sample of brazilian women


  • Disclosure: The authors declared no conflict of interest.

    Author contributions: MC, PA, and LD conceived and carried out experiments. FM, EC, and FF conceived experiments and analysed data. SF, LC, and JM carried out experiments. All authors were involved in writing the article and had final approval of the submitted and published versions.



This study aimed to verify the validity of BAI in predicting %BF in a sample of Brazilian women

Design and Methods

A total of 102 women (average age 60.3 ± 9.8) were assessed. To determine percentage body fat (% BF), dual-energy X-ray absorptiometry (DXA) was used as the “gold standard.” To evaluate the association between body adiposity index (BAI) and % BF assessed by DXA, we used Pearson's correlation coefficient. Paired sample t-test was used to test differences in mean % BF between BAI and DXA. To evaluate the concordance between % BF measured by DXA and estimated by BAI, we used the Lin's concordance correlation coefficient and the agreement analysis of Bland-Altman.


The correlation between % BF obtained by DXA and that estimated by BAI was r = 0.65, P < 0.001. Paired t-test showed significant mean difference between methods (P < 0.0001). Lin's concordance correlation coefficient was C_b = 0.73, which is classified as poor, while the Bland-Altman plots showed BAI underestimating % BF in relation to the used criterion measure in a large portion of the sample.


Results of the present study show that BAI presented low agreement with % BF measured by DXA, which is not recommended for % BF prediction in this studied sample.