title: Agreement of BMI-Based Equations and DXA in Determining Body-Fat Percentage in Adults With Down Syndrome.
abstract: The purpose of this investigation was to evaluate measurements of body-fat percentage (BF%) in 4 body-mass-index- (BMI) -based equations and dual-energy X-ray absorptiometry (DXA) in individuals with Down syndrome (DS). Ten male and 10 female adults with DS volunteered for this study. Four regression equations for estimating BF% based on BMI previously developed by Deurenberg et al. (DE(BMI-BF%)), Gallagher et al. (GA(BMI-BF%)), Womersley & Durnin (WO(BMI-BF%)), and Jackson et al. (JA(BMI-BF%)) were compared with DXA. There was no significant difference (p = .659) in mean BF% values between JA(BMI-BF%) (BF% = 40.80% ± 6.3%) and DXA (39.90% ± 11.1%), while DE(BMI-BF%) (34.40% ± 9.0%), WO(BMI-BF%) (35.10% ± 9.4%), and GA(BMI-BF%) (35.10% ± 9.4%) were significantly (p < .001) lower. The limits of agreement (1.96 SD of the constant error) varied from 9.80% to 16.20%. Therefore, BMI-based BF% equations should not be used in individuals with DS.
authors.affiliation: Dept. of Kinesiology, University of Alabama, Tuscaloosa, AL.
authors.forename: Michael R
authors.initials: MR
authors.lastname: Esco
authors.forename: Brett S
authors.initials: BS
authors.lastname: Nickerson
authors.forename: Sara C
authors.initials: SC
authors.lastname: Bicard
authors.forename: Angela R
authors.initials: AR
authors.lastname: Russell
authors.forename: Phillip A
authors.initials: PA
authors.lastname: Bishop
mesh_terms: D015502:Absorptiometry, Photon; D000328:Adult; D050218:Body Fat Distribution; D015992:Body Mass Index; D004314:Down Syndrome; D005260:Female; D006801:Humans; D008297:Male; D012044:Regression Analysis