Table 1.

Published equations used to convert body density into %FM

Author(s) (reference)	Sample population	Equation
Siri (7)	Equation based on fat-free reference body from theoretical population	(495/BD)-450
Lohman et al. (9)	54 prepubescent African American and white boys and girls	(530/BD)-489
Schutte et al. (8)	15 African American men, 18–32 y old	(437.4/BD)-392.8
Westrate and Deurenberg (12)	Derived from data of Fomon et al. (32) on 0- to 10-y-old boys and girls, from a variety of studies	$\text{Boys}2–18\text{y}\text{old}:\{[(562-4.2(\text{age}-2)]/\text{BD}\}-[5.25-4.7(\text{age}-2)]$ $\text{Girls}2–10\text{y}\text{old}:\{[(562-1.1(\text{age}-2)]/\text{BD}\}-[525-1.4(\text{age}-2)]$ $\text{Girls}10–18\text{y}\text{old}:\{[(553-7.3(\text{age}-10)]/\text{BD}\}-[514-8.0(\text{age}-10)]$ where age is in years
Wells et al. (10)	30 boys and girls, 8–12 y old, ethnicity not specified	(527/BD)-485
Bray et al. (11)	129 African American and white boys and girls, 10–12 y old	(446/BD)-402

BD, body density.