Development of Anthropometry-Based Equations for the Estimation of the Total Body Water in Koreans
For developing race-specific anthropometry-based total body water (TBW) equations, we measured TBW using bioelectrical impedance analysis (TBW BIA ) in 2,943 healthy Korean adults. Among them, 2,223 were used as a reference group. Two equations (TBW K1 and TBW K2 ) were developed based on age, sex, height, and body weight. The adjusted R 2 was 0.908 for TBW K1 and 0.910 for TBW K2 . The remaining 720 subjects were used for the validation of our results. Watson (TBW W ) and Hume-Weyers (TBW H ) formulas were also used. In men, TBW BIA showed the highest correlation with TBW H , followed by TBW K1 , TBW K2 and TBW W . TBW K1 and TBW K2 showed the lower root mean square errors (RMSE) and mean prediction errors (ME) than TBW W and TBW H . On the Bland-Altman plot, the correlations between the differences and means were smaller for TBW K2 than for TBW K1 . On the contrary, TBW BIA showed the highest correlation with TBW W , followed by TBW K2 , TBW K1 , and TBW H in females. RMSE was smallest in TBW W , followed by TBW K2 , TBW K1 and TBW H . ME was closest to zero for TBW K2 , followed by TBW K1 , TBW W and TBW H . The correlation coefficients between the means and differences were highest in TBW W , and lowest in TBW K2 . In conclusion, TBW K2 provides better accuracy with a smaller bias than the TBW W or TBW H in males. TBW K2 shows a similar accuracy, but with a smaller bias than TBW W in females.
- DOI : http://dx.doi.org/10.3346/jkms.2005.20.3.445
- 대한의학회 : 저널
- PubMed Central : 저널 > https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2782201
- Synapse : 저널
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