Eisenkölbl J, Kartasurya M, Widhalm K
Department of Pediatrics, Division of Neonatology, Intensive Care and Congenitas Anomalies, University of Vienna, Vienna, Austria.
Eur J Clin Nutr. 2001 Jun;55(6):423-9. doi: 10.1038/sj.ejcn.1601184.
The aim of the study was to investigate whether there is a difference between body fat mass percentage measured by BIA and DXA method.
Transversal study, randomized.
Lipid and Obesity Outpatient Clinic, Department of Pediatrics, University of Vienna, Austria.
Twenty-seven children and adolescents from the Lipid and Obesity Outpatient Clinic, Department of Pediatrics, University of Vienna, were included in the study (14 boys and 13 girls between 6 and 18 y; mean age 12.6 and 13.1 y).
The body fat percentage was measured with BIA (bioelectrical impedance analyzer BIA 2000-M) and DXA (dual energy X-ray absorptiometry) methods on the same day.
The mean difference between the body fat mass percentage measured by BIA and DXA was 4.48 with a standard deviation of 2.93. The results measured by BIA were almost always lower than that by DXA by about 12%. The lower and upper limit of the difference in 95% confidence interval was -5.64 and -3.32. By paired t-test, these results were significantly different (P<0.001). The correlation between the two measurements was 0.826. The mean percentage of body fat mass measured by BIA was 34.86+/-7.08% and by DXA 39.75+/-5.63%. The differences were not changed by age and body fat percentage but they were by sex.
The results of the study show that the body fat percentages measured by BIA and DXA method were significantly different. This is very important because BIA technique is a routine technique for clinical purposes. Adjustments to the formula used for calculating the total fat mass in obese children and adolescence are necessary. Underestimation of body fat percentage measured by bioelectrical impedance analysis compared to dual X-ray absorptiometry method in obese children is three times higher with boys than with girls.
本研究旨在调查通过生物电阻抗分析（BIA）法和双能X线吸收法（DXA）测量的体脂质量百分比之间是否存在差异。
横断面随机研究。
奥地利维也纳大学儿科学系脂质与肥胖门诊。
来自维也纳大学儿科学系脂质与肥胖门诊的27名儿童和青少年纳入研究（14名男孩和13名女孩，年龄在6至18岁之间；平均年龄分别为12.6岁和13.1岁）。
同一天采用BIA（生物电阻抗分析仪BIA 2000-M）和DXA（双能X线吸收法）测量体脂百分比。
BIA法和DXA法测量的体脂质量百分比的平均差异为4.48，标准差为2.93。BIA法测量的结果几乎总是比DXA法低约12%。95%置信区间差异的下限和上限分别为-5.64和-3.32。通过配对t检验，这些结果有显著差异（P<0.001）。两次测量的相关性为0.826。BIA法测量的体脂质量平均百分比为34.86±7.08%，DXA法为39.75±5.63%。差异不受年龄和体脂百分比影响，但受性别影响。
研究结果表明，BIA法和DXA法测量的体脂百分比有显著差异。这非常重要，因为BIA技术是临床常用技术。肥胖儿童和青少年用于计算总脂肪量的公式需要调整。与双能X线吸收法相比，肥胖儿童中通过生物电阻抗分析测量的体脂百分比被低估的情况，男孩比女孩高3倍。
