Rush E C, Puniani K, Valencia M E, Davies P S W, Plank L D
Department of Applied Science, Auckland University of Technology, Auckland, New Zealand.
Eur J Clin Nutr. 2003 Nov;57(11):1394-401. doi: 10.1038/sj.ejcn.1601701.
To compare percentage body fat (%BF) for a given body mass index (BMI) among New Zealand European, Maori and Pacific Island children. To develop prediction equations based on bioimpedance measurements for the estimation of fat-free mass (FFM) appropriate to children in these three ethnic groups.
Cross-sectional study. Purposive sampling of schoolchildren aimed at recruiting three children of each sex and ethnicity for each year of age. Double cross-validation of FFM prediction equations developed by multiple regression.
Local schools in Auckland.
Healthy European, Maori and Pacific Island children (n=172, 83 M, 89 F, mean age 9.4+/-2.8(s.d.), range 5-14 y).
Height, weight, age, sex and ethnicity were recorded. FFM was derived from measurements of total body water by deuterium dilution and resistance and reactance were measured by bioimpedance analysis.
For fixed BMI, the Maori and Pacific Island girls averaged 3.7% lower %BF than European girls. For boys a similar relation was not found since BMI did not significantly influence %BF of European boys (P=0.18). Based on bioimpedance measurements a single prediction equation was developed for all children: FFM (kg)=0.622 height (cm)(2)/resistance+0.234 weight (kg)+1.166, R(2)=0.96, s.e.e.=2.44 kg. Ethnicity, age and sex were not significant predictors.
A robust equation for estimation of FFM in New Zealand European, Maori and Pacific Island children in the 5-14 y age range that is more suitable than BMI for the determination of body fatness in field studies has been developed.
比较新西兰欧洲裔、毛利族和太平洋岛民儿童在给定体重指数（BMI）下的体脂百分比（%BF）。基于生物电阻抗测量结果，开发预测方程，以估算这三个种族儿童的去脂体重（FFM）。
横断面研究。对学童进行目的抽样，目标是为每个年龄组招募每种性别和种族的三名儿童。对多元回归得出的FFM预测方程进行双重交叉验证。
奥克兰当地学校。
健康的欧洲裔、毛利族和太平洋岛民儿童（n = 172，男83名，女89名，平均年龄9.4±2.8（标准差），范围5 - 14岁）。
记录身高、体重、年龄、性别和种族。通过氘稀释法测量总体水来得出FFM，并通过生物电阻抗分析测量电阻和电抗。
对于固定的BMI，毛利族和太平洋岛民女孩的平均%BF比欧洲裔女孩低3.7%。对于男孩，未发现类似关系，因为BMI对欧洲裔男孩的%BF没有显著影响（P = 0.18）。基于生物电阻抗测量结果，为所有儿童开发了一个单一预测方程：FFM（kg）= 0.622×身高（cm）²/电阻 + 0.234×体重（kg）+ 1.166，R² = 0.96，标准误差估计值 = 2.44 kg。种族、年龄和性别不是显著预测因素。
已开发出一个可靠的方程，用于估算5 - 14岁的新西兰欧洲裔、毛利族和太平洋岛民儿童的FFM，在现场研究中，该方程比BMI更适合用于确定体脂率。
