Comparison of bioelectrical impedance analysis and dual energy X ray absorptiometry in measuring body composition among Tibetan children and adolescents
10.16835/j.cnki.1000-9817.2026124
- VernacularTitle:生物电阻抗法和双能X射线吸收法测定藏族儿童青少年体成分的比较
- Author:
JIAN Wenxiu, ZHANG Bin, ZHOU Keting, CHEN Hongru, SUN Mengzi, XU Ruijie,WANG Haijing, WANG Youfa, PENG Wen
1
Author Information
1. Department of Public Health, School of Medicine, Qinghai University, Xining 810008, Qinghai Province, China
- Publication Type:Journal Article
- Keywords:
Body composition;
Growth and development;
Child;
Adolescent;
Minority groups
- From:
Chinese Journal of School Health
2026;47(4):569-573
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To compare the consistency between bioelectrical impedance analysis (BIA) and dual energy X ray absorptiometry (DXA) in measuring body composition among Tibetan children and adolescents and to explore the applicability of BIA in plateau region, so as to provide scientific and convenient body composition measurement support among children and adolescents.
Methods:From May to June, 2022, a total of 344 Tibetan children and adolescents aged 6-17 years were selected from Golmud Municipal National Middle School and Changjiangyuan Nationality Primary School in Qinghai Province by cluster sampling method, and their fat mass, fat mass percentage and lean mass were measured by DXA and BIA. The consistency and correlation between the two methods were assessed by using the Wilcoxon rank-sum test, Spearman correlation analysis, intraclass correlation coefficient (ICC), and Bland-Altman analysis.
Results:DXA measured fat mass and fat mass percentage were significantly higher than those obtained by BIA (6-12 years old: Z =9.91, 11.28; 13-17 years old: Z =9.02, 10.21), while lean mass and lean mass percentage were significantly lower than BIA results (6-12 years old: Z =-11.60, -11.30; 13-17 years old: Z =-10.77, -10.36) (all P < 0.05 ). The two methods showed strong correlations in fat mass and lean mass (all r >0.80, all ICC >0.90), but exhibited poor agreement in fat mass percentage and lean mass percentage (6-12 years old: Lin s CCC =0.64, 0.41; 13-17 years old: Lin s CCC = 0.79 , 0.35). Bland-Altman analysis showed that the difference between the two methods was negatively correlated with the average value in FM%(6-12 years old: r =-0.75, 13-17 years old: r =-0.79, both P <0.01).
Conclusion:BIA and DXA show high consistency in measuring body fat mass and lean body mass in Tibetan children and adolescents, although some bias is still present in certain individuals.
