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Total body water reference values and prediction equations for adults.
W C Chumlea1, S S Guo, C M Zeller
1Department of Community Health, Wright State University School of Medicine, Dayton, Ohio, USA. cameron.chumlea@wright.edu
Kidney International
|June 16, 2001
Summary
New anthropometric equations provide accurate total body water (TBW) predictions for white and black adults, crucial for managing renal disease and dialysis. These race- and sex-specific models improve upon outdated methods for predicting urea distribution (V).
Area of Science:
- Physiology
- Anthropometry
- Renal Medicine
Background:
- Accurate total body water (TBW) reference data is vital for clinical interpretation, especially in renal disease for dialysis dosing (Kt/V).
- Existing anthropometric equations for predicting urea distribution (V) are outdated and primarily based on white populations.
- This study introduces new reference values and prediction equations for TBW in adult populations.
Purpose of the Study:
- To develop and validate new race- and sex-specific anthropometric prediction equations for total body water (TBW).
- To provide updated reference data for TBW in diverse adult populations.
- To enhance the clinical prediction of TBW for individuals with renal disease.
Main Methods:
- A study sample of 1,195 adults (604 white men, 128 black men, 772 white women, 191 black women) aged 18-90.
- TBW measured using deuterium or tritium oxide dilution; body composition assessed with Lunar DXA.
- All-possible-subsets regression used for prediction equation development, with cross-validation for accuracy confirmation.
Main Results:
- Black adults exhibited higher mean TBW than white adults across all age groups.
- New race- and sex-specific prediction equations for TBW were developed, incorporating age, weight, stature, and BMI (for white men).
- Prediction errors (RMSEs and SEIs) ranged from 3.3-5.0 L; high TBW correlated with high total body fat and fat-free mass.
Conclusions:
- Total body water (TBW) is relatively stable in adulthood but shows significant race and sex variations.
- The developed equations offer accurate and precise tools for clinical TBW prediction in white and black adults with renal disease.
- These represent the first TBW prediction equations specifically developed for black populations.