Department of Public and Occupational Health, EMGO Institute for Health and Care Research, VU University Medical Center, Amsterdam, The Netherlands.
Obes Rev. 2013 Nov;14(11):895-905. doi: 10.1111/obr.12061. Epub 2013 Jul 12.
Bioelectrical impedance analysis (BIA) is a practical method to estimate percentage body fat (%BF). In this systematic review, we aimed to assess validity, responsiveness, reliability and measurement error of BIA methods in estimating %BF in children and adolescents.We searched for relevant studies in Pubmed, Embase and Cochrane through November 2012. Two reviewers independently screened titles and abstracts for inclusion, extracted data and rated methodological quality of the included studies. We performed a best evidence synthesis to synthesize the results, thereby excluding studies of poor quality. We included 50 published studies. Mean differences between BIA and reference methods (gold standard [criterion validity] and convergent measures of body composition [convergent validity]) were considerable and ranged from negative to positive values, resulting in conflicting evidence for criterion validity. We found strong evidence for a good reliability, i.e. (intra-class) correlations ≥0.82. However, test-retest mean differences ranged from 7.5% to 13.4% of total %BF in the included study samples, indicating considerable measurement error. Our systematic review suggests that BIA is a practical method to estimate %BF in children and adolescents. However, validity and measurement error are not satisfactory.
生物电阻抗分析（BIA）是一种实用的方法，用于估计体脂肪百分比（%BF）。在本次系统评价中，我们旨在评估 BIA 方法在评估儿童和青少年体脂肪百分比方面的有效性、反应性、可靠性和测量误差。我们通过 Pubmed、Embase 和 Cochrane 搜索了截至 2012 年 11 月的相关研究。两名评审员独立筛选标题和摘要以确定是否纳入，提取数据并对纳入研究的方法学质量进行评价。我们进行了最佳证据综合，从而排除了质量较差的研究。我们共纳入了 50 项已发表的研究。 BIA 与参考方法（金标准[判定有效性]和身体成分的收敛性测量[收敛有效性]）之间的平均差异较大，范围从负值到正值，导致判定有效性的证据相互矛盾。我们发现有强有力的证据表明其可靠性良好，即（组内）相关性≥0.82。然而，在纳入研究样本中，测试-重测的平均差异范围为总 %BF 的 7.5%至 13.4%，表明存在相当大的测量误差。我们的系统评价表明，BIA 是一种实用的方法，可用于评估儿童和青少年的体脂肪百分比。然而，其有效性和测量误差并不令人满意。
