Estimates of body composition with dual-energy X-ray absorptiometry in adults.
October 10th, 2009 Posted by: admin
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Estimates of body composition with dual-energy X-ray absorptiometry in adults.
Am J Clin Nutr. 2009 Oct 7;
Authors: Li C, Ford ES, Zhao G, Balluz LS, Giles WH
BACKGROUND: Little is known about the distributions of percentage body fat (PBF), total body fat (TBF), and fat-free mass (FFM) in the adult population in the United States. OBJECTIVES: We sought to estimate the means and percentile cutoffs of PBF, TBF, and FFM and to assess the differences by sex, age, race-ethnicity, and body mass index in US adults. DESIGN: Data from the National Health and Nutrition Examination Survey, which were collected during the 6-y period from 1999 to 2004 and comprise a large nationally representative sample of the US population, were analyzed (n = 6559 men and 6507 nonpregnant women). TBF and FFM were measured by using dual-energy X-ray absorptiometry. PBF was calculated as TBF divided by total mass multiplied by 100. RESULTS: There were large differences between men and women in unadjusted mean PBF (28.1% compared with 40.0%, P < 0.001), TBF (25.4 compared with 30.8 kg, P < 0.001), and FFM (62.3 compared with 44.0 kg, P < 0.001); the sex differences persisted across all body mass index categories after adjustment for age and race-ethnicity (all P < 0.001). The common percentile cutoffs of PBF, TBF, and FFM were estimated by sex, race-ethnicity, and age groups. Equations for the estimation of PBF (R(2) = 0.85), TBF (R(2) = 0.94), and FFM (R(2) = 0.94) according to demographic characteristics and simple anthropometric measures were generated. CONCLUSION: The estimates of means and percentile cutoffs for PBF, TBF, and FFM, on the basis of National Health and Nutrition Examination Survey 1999-2004 dual-energy X-ray absorptiometry data, provide a reference in the US adult population.
PMID: 19812179 [PubMed - as supplied by publisher]
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