Patient population: adult
Reference measure: deuterium D2O dilution
Parameters:
(1) height in cm
(2) weight in kilograms
(3) resistance in ohms measured using bioelectrical impedance with electrodes on the right hand and foot (at 50 kHz)
total body water in liters for a male =
= (0.396 * (((height in cm)^2) / (ohms))) + (0.143 * (weight in kilograms)) + 8.399
total body water in liters for a female =
= (0.382 * (((height in cm)^2) / (ohms))) + (0.105 * (weight in kilograms)) + 8.315
total body water in liters for a male or female =
= (0.5561 * (((height in cm)^2) / (ohms))) + (0.0955 * (weight in kilograms)) + 1.726
where:
• The height squared divided by the resistance is called the impedance index.
Performance:
• The R-squared ranged from 0.975 to 0.988 and standard error of the estimate (SEE) from 0.884 to 1.748.
