title: In vivo precision of the GE iDXA for the assessment of total body composition and fat distribution in severely obese patients.
abstract: OBJECTIVE
  To evaluate the precision of the iDXA for total body composition and fat distribution measurements in severely obese patients.
  
  
  METHODS
  Sixty-five severely obese participants with a mean age of 46 ± 11 years, BMI of 49 ± 6 kg/m(2) , and a mean body mass of 137.3 ± 20.9 kg took part in this investigation. Two consecutive iDXA scans with repositioning of the total body were conducted for each participant. The coefficient of variation (CV), the root-mean-square (RMS) averages of standard deviations of repeated measurements, the corresponding 95% least significant change, and Intraclass Correlations (ICC) were calculated.
  
  
  RESULTS
  Precision expressed as % CV, for total body bone mineral content, fat free mass, total body fat, total body lean, and % total body fat were 1.08%, 0.94%, 0.90%, 1.00%, 0.79%, respectively. Precision was 1.44% for gynoid fat distribution and 1.64% for android fat (AF) distribution. The ICCs in all DXA measurements were 0.99 with % AF having the lowest at 0.96.
  
  
  CONCLUSIONS
  The GE Lunar iDXA™ demonstrated excellent precision for total body composition assessments and is the first study to assess reproducibility in severely obese individuals.
authors: McGill University, Department of Kinesiology and Physical Education, Montreal, QC, Canada.
authors: Tamara E
authors: TE
authors: Carver
authors: Nicholas V
authors: NV
authors: Christou
authors: Ross E
authors: RE
authors: Andersen
mesh_terms: D015502:Absorptiometry, Photon / Q000295:instrumentation* / Q000379:methods*; D000328:Adult; D001823:Body Composition; D050218:Body Fat Distribution; D015992:Body Mass Index; D015519:Bone Density; D015331:Cohort Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000378:metabolism*; D015203:Reproducibility of Results