Comparison of the measurements of two different body composition analyzers

Abstract

[Purpose]The aim of this study was to derive correction formulae for two different body composition analyzers by comparison using Bland-Altman plots. [Subjects and Methods] The body compositions of 744 elderly persons attending a comprehensive health examination were measured while they stood barefoot on two different bio-impedance body composition analyzers. The data pairs from the two instruments were compared using correlation analysis and Bland-Altman plots, and correction formulae were derived considering the proportional and fixed biases. [Results] Proportional biases were found for percent body fat and body fat mass, and fixed biases were found for percent body fat, body fat, lean body mass, the skeletal muscle index, and segmental muscle mass. Values computed using the correction formulas considering the biases were in good agreement, and the differences between the two instruments became exceedingly small. [Conclusion] It will be possible to compare the measurement values of these two instruments using the correction formulas.