External cross-validation of bioelectrical impedance analysis for the assessment of body composition in Korean adults

  • Kim, Hyeoi-Jin (Measurement and evaluation in sports science, Soonchunhyang University) ;
  • Kim, Chul-Hyun (Department of Physiology and Biophysics, Antiaging Research Center, School of Medicine, Eulji University) ;
  • Kim, Dong-Won (Department of Anesthesiology and Pain Medicine, College of Medicine, Hanyang University) ;
  • Park, Mi-Ra (Department of Preventive Medicine, School of Medicine, Eulji University) ;
  • Park, Hye-Soon (Department of Family Medicine, Asan Medical Center) ;
  • Min, Sun-Seek (Department of Physiology and Biophysics, Antiaging Research Center, School of Medicine, Eulji University) ;
  • Han, Seung-Ho (Department of Physiology and Biophysics, Antiaging Research Center, School of Medicine, Eulji University) ;
  • Yee, Jae-Yong (Department of Physiology and Biophysics, Antiaging Research Center, School of Medicine, Eulji University) ;
  • Chung, So-Chung (Department of Pediatrics, Konkuk University Medical Center, School of Medicine, Konkuk University) ;
  • Kim, Chan (Department of Physiology and Biophysics, Antiaging Research Center, School of Medicine, Eulji University)
  • 투고 : 2010.12.28
  • 심사 : 2011.06.14
  • 발행 : 2011.06.30


Bioelectrical impedance analysis (BIA) models must be validated against a reference method in a representative population sample before they can be accepted as accurate and applicable. The purpose of this study was to compare the eight-electrode BIA method with DEXA as a reference method in the assessment of body composition in Korean adults and to investigate the predictive accuracy and applicability of the eight-electrode BIA model. A total of 174 apparently healthy adults participated. The study was designed as a cross-sectional study. FM, %fat, and FFM were estimated by an eight-electrode BIA model and were measured by DEXA. Correlations between BIA_%fat and DEXA_%fat were 0.956 for men and 0.960 for women with a total error of 2.1%fat in men and 2.3%fat in women. The mean difference between BIA_%fat and DEXA_%fat was small but significant (P < 0.05), which resulted in an overestimation of $1.2{\pm}2.2$%fat (95% CI: -3.2-6.2%fat) in men and an underestimation of $-2.0{\pm}2.4$%fat (95% CI: -2.3-7.1%fat) in women. In the Bland-Altman analysis, the %fat of 86.3% of men was accurately estimated and the %fat of 66.0% of women was accurately estimated to within 3.5%fat. The BIA had good agreement for prediction of %fat in Korean adults. However, the eight-electrode BIA had small, but systemic, errors of %fat in the predictive accuracy for individual estimation. The total errors led to an overestimation of %fat in lean men and an underestimation of %fat in obese women.


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