In vivo precision of the GE iDXA for the assessment of total body composition and fat distribution in severely obese patients
Article first published online: 29 MAY 2013
Copyright © 2013 The Obesity Society
Volume 21, Issue 7, pages 1367–1369, July 2013
How to Cite
Carver, T. E., Christou, N. V. and Andersen, R. E. (2013), In vivo precision of the GE iDXA for the assessment of total body composition and fat distribution in severely obese patients. Obesity, 21: 1367–1369. doi: 10.1002/oby.20323
- Issue published online: 12 AUG 2013
- Article first published online: 29 MAY 2013
- Accepted manuscript online: 18 FEB 2013 12:14AM EST
- Manuscript Accepted: 9 DEC 2012
- Manuscript Received: 10 MAY 2012
To evaluate the precision of the iDXA for total body composition and fat distribution measurements in severely obese patients.
Design and Methods
Sixty-five severely obese participants with a mean age of 46 ± 11years, BMI of 49 ± 6 kg/m2, 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.
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.
The GE Lunar iDXA™ demonstrated excellent precision for total body composition assessments and is the first study to assess reproducibility in severely obese individuals.