A method comparison study to validate a novel parameter of obesity, the body adiposity index, in chinese subjects
Disclosure: None reported. The authors declare no competing interests.
Funding agencies: This study was supported by the Alexandra Health Enabling Grant, FY 2011. The sponsors had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; and preparation, review, or approval of the manuscript.
Author contributions: BCC Lam had full access to all of the published data in the study and takes responsibility for the integrity of the data and the accuracy of data analysis. Study concept and design: BCC Lam, CY Ho, JIE Bosco, MTK Wong. Acquisition of data: BCC Lam, CY Ho, JIE Bosco. Analysis and interpretation of data: BCC Lam, SC Lim, E Shum, GCH Koh, C Chen. Drafting of the manuscript: BCC Lam. Critical revision of the manuscript for important intellectual content: SC Lim, E Shum, GCH Koh, MTK Wong, C Chen. Study supervision: BCC Lam, MTK Wong. All authors were involved in writing the article and had final approval of the submitted and published versions.
A recently developed parameter, the body adiposity index (BAI)—a composite index based on hip circumference and height—estimates the percentage (%) body adiposity indirectly. The BAI was compared with dual energy X-ray absorptiometer (DEXA)-derived % adiposity to validate the BAI in the local Chinese population.
Design and Methods
105 Chinese were recruited and % adiposity estimated by BAI was compared with that derived from DEXA using the Bland Altman plot. A correlation study comparing the BAI with body mass index (BMI) was also done.
BAI underestimated DEXA-derived % adiposity by a mean of 5.77% with 95% limits of agreement of ±8.4%. When stratified by gender, BMI correlated with DEXA-derived % adiposity better than BAI (r = 0.81 vs. 0.74 for males, P = 0.088, and r = 0.87 vs. 0.82 for females, P = 0.087). Hip circumference and waist circumference also correlated better with the BMI than BAI (r = 0.94 vs. 0.71 for hip circumference, P < 0.001, and r = 0.93 vs. 0.50 for waist circumference, P < 0.001, respectively).
The BAI underestimates DEXA-derived % adiposity in a Chinese population in Singapore and is unlikely to be a better overall index of adiposity than the established BMI.