title: Comparison of body composition methods in obese African-American women.
abstract: OBJECTIVE
  To compare the accuracy of percentage body fat (%BF) estimates between bioelectrical impedance analysis (BIA) and DXA in obese African-American women.
  
  
  METHODS
  Fifty-five obese African-American women (mean age, 45 years; mean BMI, 38; mean %BF, 48%) were studied. BF was assessed by both BIA (RJL Systems BIA 101Q; RJL Systems, Clinton Township, MI) and DXA (Hologic QDR-2000 Bone Densitometer; Hologic Inc., Bedford, MA). Generalized and ethnicity- and obese-specific equations were used to calculate %BF from the BIA. Bland-Altman analyses were used to compare the agreement between the BIA and the DXA, with the DXA serving as the criterion measure.
  
  
  RESULTS
  Two of the generalized equations provided consistent estimates across the weight range in comparison with the DXA estimates, whereas most of the other equations increasingly underestimated %BF as BF increased. One of the generalized and one of the ethnicity-specific equations had mean differences that were not significantly different from the DXA value.
  
  
  CONCLUSIONS
  The findings show that the Lukaski equation provided the most precise and accurate estimates of %BF in comparison with the QDR 2000 and provide preliminary support for the use of this equation for obese African-American women.
authors.affiliation: Pennington Biomedical Research Center, Louisiana State University, 6400 Perkins Road, Baton Rouge, LA 70808, USA. NewtonRL@pbrc.edu
authors.forename: Robert L
authors.initials: RL
authors.lastname: Newton
authors.forename: Anthony
authors.initials: A
authors.lastname: Alfonso
authors.forename: Emily
authors.initials: E
authors.lastname: York-Crowe
authors.forename: Heather
authors.initials: H
authors.lastname: Walden
authors.forename: Marney A
authors.initials: MA
authors.lastname: White
authors.forename: Donna
authors.initials: D
authors.lastname: Ryan
authors.forename: Donald A
authors.initials: DA
authors.lastname: Williamson
mesh_terms: D015502:Absorptiometry, Photon; D000328:Adult; D001741:Black or African American; D000886:Anthropometry; D001823:Body Composition; D017097:Electric Impedance; D005260:Female; D006801:Humans; D008875:Middle Aged; D008962:Models, Theoretical; D009765:Obesity / Q000175:diagnosis* / Q000208:ethnology*; D012680:Sensitivity and Specificity