Murphy Alexia J, Davies Peter S W
Children's Nutrition Research Centre, Discipline of Paediatrics and Child Health, Royal Children's Hospital, University of Queensland, Herston, Queensland 4029, Australia.
Br J Nutr. 2008 Sep;100(3):666-8. doi: 10.1017/S0007114507901269. Epub 2008 Jan 15.
Body cell mass (BCM) is a valuable measure of functional nutritional status in children. As BCM is related to body size, it is essential that BCM is adjusted for stature when interpreting BCM data in children. Our aim was to examine the relationship between height and BCM in healthy children to determine the power by which height should be raised to adjust BCM for stature. This cross-sectional study calculated BCM by 40K counting in 146 healthy children aged between 5 and 18 years. The relationship between BCM and height was explored using log-log regression. The present results demonstrate that the power by which height should be raised to adjust for BCM in females is 2.39 (se 0.09) and for males is 2.92 (se 0.10). A simplified sex-specific version of the index, BCM/height2.5 for females and BCM/height3 for males, was found to be statistically valid and numerically convenient, with the proportion of variation that could be attributed to height being less than 2 %. The present study shows that there is a difference in the relationship between height and BCM for males and females and that BCM can be adjusted in children using the BCM index of BCM/height2.5 for females and BCM/height3 for males.
体细胞质量（BCM）是衡量儿童功能性营养状况的一项重要指标。由于BCM与身体大小相关，因此在解读儿童BCM数据时，根据身高对BCM进行调整至关重要。我们的目的是研究健康儿童身高与BCM之间的关系，以确定应将身高提升的幂次，以便根据身高对BCM进行调整。这项横断面研究通过对146名年龄在5至18岁的健康儿童进行40K计数来计算BCM。使用对数-对数回归探讨了BCM与身高之间的关系。目前的结果表明，女性调整BCM时身高应提升的幂次为2.39（标准误0.09），男性为2.92（标准误0.10）。发现该指数的简化性别特异性版本，即女性为BCM/身高2.5，男性为BCM/身高3，在统计学上有效且数值上方便，可归因于身高的变异比例小于2%。本研究表明，男性和女性身高与BCM之间的关系存在差异，并且可以使用女性为BCM/身高2.5、男性为BCM/身高3的BCM指数对儿童的BCM进行调整。
