Ellis K J
USDA/ARS Children's Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, TX 77030-2600, USA.
Int J Obes Relat Metab Disord. 1996 Sep;20(9):866-73.
To determine the level of agreement for body fatness measurements among four body composition measurement techniques.
99 healthy children and young adults (63 males, 36 females; ages: 5-22 y)
Bioelectrical impedance analysis (BIA), bioelectrical impedance spectroscopy (BIS), total body electrical conductivity (TOBEC), and dual-energy X-ray absorptiometry (DXA) measurements of body fat mass, and its percentage of body weight (% Fat).
Estimates for body fat mass and % Fat were highly correlated (r = 0.72-0.97, P < 0.001) among the four methods. However, a Bland-Altman comparison among the estimates indicated significant differences between methods. The mean differences between methods for body fat ranged from -0.30 +/- 6.7 kg to 4.2 +/- 2.7 kg. Differences for % Fat ranged from 0.8% +/- 3.5% to -9.9% +/- 5.2%. Fatness classification of an individual as normal, overweight, or obese on the basis of his/her % Fat was significantly method dependent.
The lack of interchangeability for fatness classification makes it difficult to ensure that similar groups of subjects can be accurately selected for the same true fat content or % Fat range when different methods are used. Furthermore, this limitation may restrict comparison of findings among different studies, such as in weight reduction, exercise, or therapy programs, when the subjects were not originally classified using the same measurement methods. That is, the reported values and changes for body fat or % Fat appear to be highly method dependent.
确定四种身体成分测量技术在身体脂肪测量方面的一致性水平。
99名健康儿童和青年（63名男性，36名女性；年龄：5 - 22岁）
采用生物电阻抗分析（BIA）、生物电阻抗光谱法（BIS）、全身电导率（TOBEC）以及双能X线吸收法（DXA）测量身体脂肪量及其占体重的百分比（%脂肪）。
四种方法对身体脂肪量和%脂肪的估计高度相关（r = 0.72 - 0.97，P < 0.001）。然而，各估计值之间的Bland - Altman比较表明不同方法之间存在显著差异。身体脂肪量测量方法之间的平均差异范围为 - 0.30 ± 6.7千克至4.2 ± 2.7千克。%脂肪的差异范围为0.8% ± 3.5%至 - 9.9% ± 5.2%。根据个体的%脂肪将其肥胖程度分类为正常、超重或肥胖，这显著依赖于测量方法。
肥胖程度分类缺乏互换性，这使得当使用不同方法时，难以确保能准确挑选出具有相同真实脂肪含量或%脂肪范围的相似受试群体。此外，这种局限性可能会限制不同研究结果之间的比较，例如在减肥、运动或治疗项目中，若受试对象最初并非使用相同测量方法进行分类时。也就是说，所报告的身体脂肪或%脂肪的值及变化似乎高度依赖于测量方法。
