Van Loan and Mayclin reported an equation for predicting total body water using bioelectric impedance analysis (BIA). The authors are from the US Department of Agriculture (USDA).
Patient selection: age from 18 to 64 years
Parameters:
(1) height in centimeters
(2) weight in kilograms
(3) resistance in Ohms at 50 kHz
(4) sex
(5) age in years
Parameter
Finding
Points
height in cm
0.000723 * ((height)^2)
weight in kg
0.2822 * (weight)
resistance
-0.0153 * (resistance)
sex
male
0
female
-2.3313
age
-0.1319 * (age)
volume of total body water in liters =
= SUM(points for all of the parameters) + 9.9868
Performance:
• R^2 0.871 with SEE 2.919.
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