title: Comparison of dual-energy X-ray absorptiometry, air displacement plethysmography and bioelectrical impedance analysis for the assessment of body composition in morbidly obese women.
abstract: OBJECTIVE
  We evaluated the agreement of air displacement plethysmography (ADP) and bioelectrical impedance analysis (BIA) with dual-energy X-ray absorptiometry (DXA) for the assessment of percent fat mass (%FM) in morbidly obese women.
  
  
  METHODS
  Fifty-seven women aged 19-55 years and with a body mass index (BMI) ranging from 37.3 to 55.2 kg/m(2) were studied. Values of %FM were obtained directly from ADP and DXA, whereas for BIA we estimated fat-free mass (FFM) from an equation for morbidly obese subjects and calculated %FM as (weight-FFM)/weight.
  
  
  RESULTS
  The mean (s.d.) difference between ADP and DXA for the assessment of %FM was -2.4% (3.3%) with limits of agreement (LOA) from -8.8% to 4.1%. The mean (s.d.) difference between BIA and DXA for the assessment of %FM was 1.7% (3.3%) with LOA from -4.9% to 8.2%.
  
  
  CONCLUSIONS
  ADP-DXA and BIA-DXA are not interchangeable methods for the assessment of body composition in morbidly obese women.
authors.affiliation: 1] Clinical Epidemiology Unit, Liver Research Center, AREA Science Park, Trieste, Italy [2] International Center for the Assessment of Nutritional Status (ICANS), University of Milan, Milan, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Bedogni
authors.forename: F
authors.initials: F
authors.lastname: Agosti
authors.forename: A
authors.initials: A
authors.lastname: De Col
authors.forename: N
authors.initials: N
authors.lastname: Marazzi
authors.forename: A
authors.initials: A
authors.lastname: Tagliaferri
authors.forename: A
authors.initials: A
authors.lastname: Sartorio
mesh_terms: D015502:Absorptiometry, Photon / Q000379:methods*; D000273:Adipose Tissue; D000328:Adult; D001823:Body Composition; D015992:Body Mass Index; D017097:Electric Impedance; D005260:Female; D006801:Humans; D008875:Middle Aged; D009767:Obesity, Morbid; D010991:Plethysmography / Q000379:methods*; D055815:Young Adult