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目的利用生物电阻抗方法测量儿童的体成分,建立适合我国儿童体成分的预测方程。方法在北京市采用目的抽样法选取409名7～10岁的儿童(男生220名,女生189名),测量身高和体重,采用生物电阻抗仪测量全身电阻抗和电容抗,采用单标水法测量的总体水(total body water,TBW)和去脂体重(fat-free mass,FFM)作为标准,用多元线性逐步回归法建立回归方程,并采用纯误差和Bland-Altman分析法来判断预测方程的准确度。结果 TBW的预测方程=-6.893+0.410×性别(男=1,女=0)+0.273×年龄(岁)+0.174×体重(kg)+0.081×身高(cm)+0.206×阻抗指数(cm2/Ω)(R2=0.90,均方根误差=1.2kg);FFM的预测方程=-9.742+0.784×性别(男=1,女=0)+0.429×年龄(岁)+0.227×体重(kg)+0.104×身高(cm)+0.269×阻抗指数(cm2/Ω)(R2=0.90,均方根误差=1.6kg)。TBW和FFM的预测值与测量值间差异均无统计学意义,纯误差分别是1.4、1.8kg。TBW和FFM的测量值与预测值的差值与均值之间存在显著正相关性(相关系数分别为0.24、0.23,P<0.01)。不同BMI分组的测量值与预测值间差异均无统计学意义。结论推导的预测方程有较高的精确度和准确度,能有效准确地预测我国7～10岁儿童的体成分。
Objective To measure the body composition of children by bioelectrical impedance method and establish the prediction equation suitable for the body composition of children in our country. Methods A total of 409 children aged 7-10 years (220 boys and 189 girls) were selected by the purpose of sampling in Beijing. Height and weight were measured. The electrical impedance and capacitance of the whole body were measured by bioelectrical impedance spectroscopy. Total body water (TBW) and fat-free mass (FFM) were used as the standard to establish the regression equation using multivariate linear step-by-step regression and the prediction equation was estimated using pure error and Bland-Altman analysis Accuracy Results Prediction equation of TBW = -6.893 + 0.410 * Gender (male = 1, female = 0) + 0.273 × age (years) + 0.174 × body weight (kg) + 0.081 × height (cm) + 0.206 × impedance index (cm 2 / (R2 = 0.90, root mean square error = 1.2 kg); FFM predictive equation = -9.742 + 0.784 × gender (male = 1, female = 0) +0.429 × age (years) + 0.227 × weight + 0.104 × height (cm) + 0.269 × impedance index (cm2 / Ω) (R2 = 0.90, root mean square error = 1.6 kg). There was no significant difference between the predicted value and the measured value of TBW and FFM, the pure errors were 1.4 and 1.8kg respectively. There was a significant positive correlation between the mean and the difference between the measured and predicted values of TBW and FFM (correlation coefficients were 0.24, 0.23, P <0.01, respectively). There was no significant difference between the measured and predicted values of different BMI groups. Conclusion The predictive equation has high accuracy and accuracy, which can effectively and accurately predict the body composition of children aged 7 to 10 in our country.