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In this recently published article, scientists in the United States conducted a study "Total body fat. lean, and bone mineral content (BMC) in addition to regional fat and lean mass values for arms, leas. and trunk were compared across a pencil-beam (Lunar DPXL) and 2 fan-beam (GE Lunar Prodigy and GE Lunar iDXA) dual-energy X-ray absorptiometry (DXA) systems. Subjects were a multiethnic sample of 99 healthy adult males (47%) and females (mean +/- SD: age. 46.3 +/- 16.9 yr; weight, 73.4 +/- 16.6 kg; height, 167.6 +/- 9.7 cm; body mass index, 26.0 +/- 5.2 kg/m(2)) who had whole-body scans performed within a 3-h period on the 3 systems."
"Repeated measures ANOVA was used to test the null hypothesis that the mean values for the 3 systems were equal. Translation equations between the methods were derived using regression techniques. Bone mineral content (BMC): For both Genders. total BMC by iDXA was lower (p
The researchers concluded: "Even so, cross-calibration equations should be used to examine data across systems to avoid erroneous conclusions."
Hull and colleagues published their study in the Journal of Clinical Densitometry (iDXA, Prodigy, and DPXL Dual-Energy X-ray Absorptiometry Whole-Body Scans: A Cross-Calibration Study. Journal of Clinical Densitometry, 2009;12(1):95-102).
For additional information, contact D. Gallagher, St. Luke's Roosevelt Hospital, Obes Research Center, Dept. of Medical, 1090 Amsterdam Avenue, New York City, NY 10025, USA.
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