The Segal fatness-specific bioelectrical impedance (BIA) equations are usef
ul for predicting fat-free mass (FFM). Stolarczyket al. proposed a modified
method of averaging the two equations for individuals who are neither lean
nor obese, thus eliminating the need to know % BF a priori. To cross-valid
ate this modification, we compared FFM determined using the averaging metho
d versus hydrostatic weighing for 76 adults. Per the averaging method, accu
racy for males was excellent (r = .91, SEE = 2.7 kg, E = 2.7 kg), with 78%
of individuals within +/-3.5% BF predicted by hydrostatic weighing. Accurac
y for females was lower (r=.88, SEE=3.0kg,E=3.1kg), with%BFof51% within +/-
3.5% of the reference method. The relative ease and practicality of the ave
raging method and the results of this study indicate this method may be use
ful with a diverse group.