Van Loan M D, Segal K R, Bracco E F, Mayclin P, Van Itallie T B
Am J Clin Nutr. 1987 Jul;46(1):9-12. doi: 10.1093/ajcn/46.1.9.
The accuracy of prediction equations for estimating lean body mass (LBM) from total-body electrical conductivity (TOBEC) was examined by cross-validation. Two samples of adults, aged 18-35 yr, were drawn from separate geographic locations. LBM was determined by densitometry and TOBEC was measured with TOBEC II instrument. LBM and TOBEC were highly correlated in both samples (r = 0.96 and 0.97). Cross-validation of LBM prediction equations was accomplished by exchanging equations and comparing predicted LBM values. There was a mean difference of 0.974 kg LBM between the two equations (p less than 0.0001). Thus, data from 157 subjects were pooled and one equation was developed that incorporated height (cm), sex (males = 0, females = 1), and the zero-, first-, and second-order Fourier coefficients (FC0, FC1, and FC2) of the TOBEC phase value: LBM, kg = -36.410 + (-1.324 X sex) + (0.01185 X (FC1(0.5)xht)) + (12.347 X FC2(0.5)) + (0.0627 X FC0)-(0.9232 X FC2) This equation, developed from 157 subjects, accounted for 96% of the variability in LBM and had a standard error of estimate of 2.17 kg LBM.
通过交叉验证检验了从全身电阻抗（TOBEC）估算瘦体重（LBM）的预测方程的准确性。从不同地理位置选取了两组18 - 35岁的成年人样本。通过密度测定法确定LBM，并使用TOBEC II仪器测量TOBEC。在两组样本中，LBM与TOBEC均高度相关（r = 0.96和0.97）。通过交换方程并比较预测的LBM值来完成LBM预测方程的交叉验证。两个方程之间LBM的平均差异为0.974 kg（p < 0.0001）。因此，将来自157名受试者的数据合并，并开发了一个包含身高（厘米）、性别（男性 = 0，女性 = 1）以及TOBEC相位值的零阶、一阶和二阶傅里叶系数（FC0、FC1和FC2）的方程：LBM（kg）= -36.410 +（-1.324×性别）+（0.01185×（FC1（0.5）×身高））+（12.347×FC2（0.5））+（0.0627×FC0）-（0.9232×FC2） 这个由157名受试者得出的方程解释了LBM中96%的变异性，估计标准误差为2.17 kg LBM。
