Comparison of Eight Equations That Predict Percent Body Fat Using Skinfolds in American Youth.
Comparison of Eight Equations That Predict Percent Body Fat Using Skinfolds in American Youth.
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使用美国青少年皮褶预测体脂百分比的八个方程的比较。
DOI：
10.1089/chi.2015.0020
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Stevens,June
中科院分区：
文献类型：
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作者：
Truesdale,KimberlyP;Roberts,Amy;Cai,Jianwen;Berge,JericaM;Stevens,June
背景：皮肤褶皱经常被用于预测年轻人的体脂百分比（PBF）。虽然有许多这样的方程出版，有有限的信息，以帮助研究人员确定使用哪个方程为sample.Methods：使用数据从1999-2006年全国健康与营养检查调查（NHANES），我们比较了8个公布的方程预测PBF。这些已发表的方程均包括三头肌和/或肩胛下皮褶厚度测量值。我们在一个全国代表性的美国青年样本中检查了PBF方程，该样本按年龄、性别和种族/民族与原始方程开发人群和8至18岁的完整样本相匹配。我们将方程预测的PBF与双发射X射线吸收法（DXA）测量的PBF进行了比较。比较校正后的R2、均方根误差（RMSE）和平均符号差（MSD）。的MSDs被用来检查的准确性和差异偏倚的年龄，性别，和种族/ethnication.Results：当应用到全方位的8- 18岁的青年，theR 2值范围从0.495到0.738。预测PBF与DXA测量PBF之间的MSD表明只有三个方程（Bray肩胛下方程和Dezenberg方程[有和没有种族/民族]）具有较高的平均准确度（MSD在-1.0到1.0之间）。大多数的方程显示性别，种族/民族，体重状况，或again.Conclusions的差异偏倚：这些研究结果表明，研究人员应谨慎选择一个方程来预测PBF在青年的结果可能会有所不同，系统的重要亚组。
Background:Skinfolds are often used in equations to predict percent body fat (PBF) in youth. Although there are numerous such equations published, there is limited information to help researchers determine which equation to use for their sample.Methods:Using data from the 1999–2006 National Health and Nutrition Examination Surveys (NHANES), we compared eight published equations for prediction of PBF. These published equations all included triceps and/or subscapular skinfold measurements. We examined the PBF equations in a nationally representative sample of American youth that was matched by age, sex, and race/ethnicity to the original equation development population and a full sample of 8- to 18-year-olds. We compared the equation-predicted PBF to the dual-emission X-ray absorptiometry (DXA)-measured PBF. The adjustedR2, root mean square error (RMSE), and mean signed difference (MSD) were compared. The MSDs were used to examine accuracy and differential bias by age, sex, and race/ethnicity.Results:When applied to the full range of 8- 18-year-old youth, theR2values ranged from 0.495 to 0.738. The MSD between predicted and DXA-measured PBF indicated high average accuracy (MSD between −1.0 and 1.0) for only three equations (Bray subscapular equation and Dezenberg equations [with and without race/ethnicity]). The majority of the equations showed differential bias by sex, race/ethnicity, weight status, or age.Conclusions:These findings indicate that investigators should use caution in the selection of an equation to predict PBF in youth given that results may vary systematically in important subgroups.