A New Body Adiposity Index (BAI) Which Applies for Both Sexes and Two Ethnic Groups
Abstract Number: 1869-P
Authors: RICHARD N. BERGMAN, DARKO STEFANOVSKI, THOMAS A. BUCHANAN, ANNE E. SUMNER, JAMES C. REYNOLDS, NANCY G. SEBRING, ANNY H. XIANG, RICHARD W. WATANABE
Institutions: Los Angeles, CA, Bethesda, MD, Pasadena, CA
Results: Obesity is a growing problem in the United States and throughout the world.
It is a risk factor for Type 2 diabetes, as well as cardiovascular disease, hypertension and cancer. It is important clinically to estimate percent body fat of individual patients. The body mass index, or BMI, has been used to assess body fat for almost 200 years.
BMI is known to be of limited accuracy, and is different for males and females with similar percent body adiposity.
Here we introduce a new index of adiposity, the Body Adiposity Index (BAI). We used a Mexican-American population from the “BetaGene” study, to develop the BAI. Percent body fat, as measured by the DEXA, was used as a “gold standard” for validation. Hip circumference (R=0.602) and height (R=-0.524) were strongly correlated with percent body fat and therefore chosen as principal anthropometric measures upon which we based BAI. We defined the novel parameter as (BAI= ([hip circumference]/([height]1.5)-18). Among the Beta-Gene participants (n=1733), the BAI was able to estimate percent body fat for adult men and women without numerical correction (R=0.79, see Figure).
The BAI measure was validated in the “TARA” study of African Americans. Correlation between DEXA-derived percent adiposity and the BAI was R=0.85 for TARA with a concordance of C_b=0.95. BAI provides an accurate estimate of percent adiposity in men and women, Mexican-American and African-American, and appears to work in Caucasian Americans. BAI is measured without weighing, which may render it useful in settings where measuring accurate body weight is problematic. We have defined a new parameter, the BAI, which can be calculated from hip circumference and height only. It can be used in the clinical setting to predict percent adiposity even in remote locations with very limited access to reliable scales. The BAI estimates percent adiposity directly.[figure1]
Category: Obesity - Human