Gillette-Guyonnet Sophie, Andrieu Sandrine, Nourhashemi Fati, Cantet Christelle, Grandjean Hélène, Vellas Bruno
Department of Internal Medicine and Clinical Gerontology (Pr JL Albarède), Centre Hospitalier Universitaire Purpan-Casselardit, 170 avenue de Casselardit, F-31300 Toulouse, France.
Mech Ageing Dev. 2003 Mar;124(3):317-21. doi: 10.1016/s0047-6374(02)00199-9.
Information is lacking regarding the comparison of bone mineral and body composition measurements obtained from the different dual energy X-ray absorptiometry (DXA) systems. The purpose of this study is to compare body composition and whole body bone mineral density (BMD) measurements from the hologic QDR-4500 W (DXA H) and the lunar (DXA L) systems. Seven women older than 40 years of age, were scanned on the same day by using DXA H and DXA L by the same observer. Measured total fat mass, percentage fat, whole body fat free soft tissue mass and BMD were similar between machines, but body mass was significantly higher with DXA L than with DXA H (P=0.0156). This was due to a higher bone mineral content obtained with DXA L. Agreement between the two DXA systems was quantified by using the Bland and Altman method. For each variable, all pairs of measurements were within the 95% confidence limits. These results suggested that we could use the two measurement methods interchangeably. However, due to the bone mineral inter-machine differences, comparisons of DXA measurements from different machines should be interpreted with caution.
关于不同双能X线吸收仪（DXA）系统所测得的骨矿物质和身体成分测量值的比较，目前信息匮乏。本研究的目的是比较来自Hologic QDR - 4500 W（DXA H）和Lunar（DXA L）系统的身体成分和全身骨密度（BMD）测量值。7名年龄大于40岁的女性在同一天由同一名观察者使用DXA H和DXA L进行扫描。两台机器测得的总脂肪量、脂肪百分比、全身去脂软组织量和骨密度相似，但DXA L测得的体重显著高于DXA H（P = 0.0156）。这是由于DXA L获得的骨矿物质含量更高。采用Bland和Altman方法对两种DXA系统之间的一致性进行了量化。对于每个变量，所有测量对均在95%置信限内。这些结果表明我们可以交替使用这两种测量方法。然而，由于不同机器之间的骨矿物质差异，对来自不同机器的DXA测量值进行比较时应谨慎解释。
