Ittenbach Richard F, Buison Anne M, Stallings Virginia A, Zemel Babette S
Biostatistics and Data Management Core, University of Pennsylvania School of Medicine, PA 19104, USA.
Ann Hum Biol. 2006 Mar-Apr;33(2):187-201. doi: 10.1080/03014460500519925.
Body composition assessment of children has been hindered by the absence of a safe, quick, and easily tolerated gold standard technique. Existing validation studies of air-displacement plethysmography (ADP) have been based on small, narrowly defined samples, using simple linear regression or Bland-Altman analyses.
Correlations within a multitrait-multimethod matrix (MTMM) and factor analytic methodologies were used to evaluate ADP as a valid and reliable body composition technique for children.
Fat mass (FM), fat-free mass (FFM) and per cent body fat (%BF) were measured in 139 children, 7-10 years old, by ADP, dual energy X-ray absorptiometry (DXA) and anthropometry (ANTH). MTMM and factor analysis were used to compare assessment techniques.
Reliability estimates were lower for ADP than for either ANTH or DXA. Convergent and discriminant correlations between ADP and ANTH or DXA were high for identical as well as non-identical measures. Two body composition factors (Fatness, Leanness) and two technique-related factors (Bod Pod, Anthropometry) were identified.
ADP offers a valid and reliable means of assessing body composition in children but does not perform as well as ANTH or DXA. MTMM and factor analytic methodologies offer an effective alternative to assessing body composition.
由于缺乏一种安全、快速且易于耐受的金标准技术，儿童身体成分评估一直受到阻碍。现有的空气置换体积描记法（ADP）验证研究基于小范围、狭义定义的样本，采用简单线性回归或布兰德-奥特曼分析。
使用多特质-多方法矩阵（MTMM）内的相关性和因子分析方法来评估ADP作为一种用于儿童的有效且可靠的身体成分技术。
通过ADP、双能X线吸收法（DXA）和人体测量法（ANTH）对139名7至10岁儿童的脂肪量（FM）、去脂体重（FFM）和体脂百分比（%BF）进行测量。使用MTMM和因子分析来比较评估技术。
ADP的可靠性估计低于ANTH或DXA。ADP与ANTH或DXA之间相同及不同测量的收敛性和区分性相关性都很高。识别出两个身体成分因子（肥胖度、瘦度）和两个技术相关因子（Bod Pod、人体测量法）。
ADP提供了一种评估儿童身体成分的有效且可靠的方法，但表现不如ANTH或DXA。MTMM和因子分析方法为评估身体成分提供了一种有效的替代方法。
