Consistency between bioelectrical impedance analysis and dual-energy X-ray absorptiometry for body composition measurement in children aged 7-17 years
10.3760/cma.j.cn112338-20200812-01062
- VernacularTitle:生物电阻抗法和双能X线吸收法测量7~17岁儿童青少年体成分的一致性评价
- Author:
Li LIU
1
;
Shuang LU
;
Liping AO
;
Junting LIU
;
Hong CHENG
;
Weihao HUANG
;
Lun YANG
;
Guangchuan ZHANG
;
Jie MI
;
Yi YANG
Author Information
1. 广东药科大学公共卫生学院流行病与卫生统计学系，广州 510006
- Keywords:
Bioelectrical impedance analysis;
Dual-energy X-ray absorptiometry;
Fat-free mass;
Fat mass;
Consistency analysis
- From:
Chinese Journal of Epidemiology
2021;42(3):475-481
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To evaluate the consistency between bioelectrical impedance analysis (BIA) and dual-energy X-ray absorptiometry (DXA) in the measurement of body composition in children and adolescents aged 7-17 years.Methods:Fat-free mass (FFM) and fat mass (FM) were measured by both BIA and DXA in 1 431 children. The consistency between the methods was evaluated by intra-class correlation coefficients (ICCs) and Bland-Altman analysis. Logarithmic transformation of both measurements was performed before Bland-Altman analysis.Results:The ICCs for FFM were 0.986 and 0.974 and ICCs for FM were 0.854 and 0.926 in boys and girls respectively. In boys, the mean ratio of FFMs by BIA and DXA was 1.04, with limits of Agreement (LoA) of 0.95-1.14, and in girls, the mean ratio of FFMs by BIA and DXA was 1.02, with the LoA of 0.90-1.15. The LoA of FFM became narrower with age in both boys and girls. Both boys and girls had the wide LoAs for FM (0.40-1.27 and 0.48-1.48, respectively). Additionally, the LoA ranges for FFM and FM narrowed with the increase of BMI level in both boys and girls.Conclusion:For all children, BIA showed good consistency with DXA for FFM, whereas significant errors occurred in FM measurement. The consistency between BIA and DXA was better for obese children than for underweight or normal-weight children.
