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Abstract:Nowadays, due to their widespread application, various models of bioelectrical impedance
analysis (BIA) devices have become available. However, differences in multiple parameters
among these BIA devices pose a significant challenge despite their common underlying
principle. The primary aim of this research was to assess the correlation, agreement, and
differences in specific body composition parameters-body fat percentage (BF%) and
muscle mass percentage (Muscle%)-measured by three distinct BIA devices (Omron
BF300, Omron BF511, and InBody 770). Measurements were conducted by the same
examiner, on the same day, in a sample of 35 women aged between 21 and 26 years.
Participants’ baseline characteristics (age, body height, body mass, body mass index) were
recorded, alongside their body composition values (BF% and Muscle%) obtained using the
three, i.e. two BIA devices, respectively. Data analysis employed SPSS 26.0 software,
applying descriptive statistics, Pearson’s correlation coefficient, concordance coefficient,
repeated measures ANOVA, paired sample t-test, and Bland-Altman plots. Results
demonstrated statistically significant correlations (p=0.000) for BF% across all three BIA
devices, and for Muscle% between Omron BF511 and InBody 770. Additionally, a significant
correlation (p=0.000) with high concordance was noted (W=0.939 for BF%, W=0.926 for
Muscle%), although significant differences among devices were also evident (p<0.001).
Given the absence of a universally accepted reference method and considering the prior
validation of InBody devices against DXA, the InBody 770 is recommended for accuracy
when possible. However, for field assessments requiring portable solutions, the Omron
BF511 is preferred due to its practicality in terms of size, weight, and portability.
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