Abstract P167: The Body Adiposity Index in Africans is a more Practical Measure of Percent Fat than Bioelectric Impedance
As the obesity epidemic overtakes Africa, practical methods to measure percent body fat need identification. Possibilities which have not been validated in Africans are the Body Adiposity Index (BAI), which uses hip circumference and height and the same formula for men and women, and bioelectric impedance (BIA) derived from NHANES III data and uses different equations for men and women. Using dual-energy X-ray absorptiometry (DXA) scans as the reference method, 107 Africans (71% male; age 39.5∓10.3 y, range 22 to 64 y; BMI 27.9∓4.5 kg/m2, range 19.7 to 41.2 kg/m2) had percent body fat assessed in two ways. Method 1 was: BAI (Hip circumference/Height1.5)-18). Method 2 was: BIA (Men: weight - (-10.678 + 0.262*weight + 0.652*height2/resistance + 0.015*resistance))/weight*100; Women: (weight - (-9.529 + 0.168*weight + 0.696*height2/resistance + 0.016*resistance))/weight*100)). Percent body fat by DXA, BAI and BIA are shown in the Figure. Concordance was between 0.5 and 0.6 with P<0.001 for DXA and BAI as well as between DXA and BIA. Bland-Altman analyses revealed the BAI estimated percent body fat with a mean difference of 1.1% and limits of agreement of -9.7 and 11.9. With BIA the mean difference was 6.0% and the limits of agreement were -2.3 and 14.4.The BAI and BIA are similar in accuracy, but BAI is easier to apply as it requires only hip circumference and height measurements and uses the same equation for men and women. Therefore, BAI is a superior measure of body fat for both clinical and epidemiological studies in Africans.
Author Disclosures: A.B. Courville: None. D. Bello: None. C.K. Thoreson: None. M.Y. O'Connor: None. S.T. Chung: None. M. Ricks: None. A.E. Sumner: None.
- © 2014 by American Heart Association, Inc.