Ww. Wong et al., Estimating body fat in African American and white adolescent girls: a comparison of skinfold-thickness equations with a 4-compartment criterion model, AM J CLIN N, 72(2), 2000, pp. 348-354
Background: Although skinfold-thickness equations are widely used to estima
te body fat, their accuracy in a biracial population of female adolescents
has not been established.
Objective: We undertook this study to determine the agreement between 8 wid
ely used skinfold-thickness equations and a 4-compartment criterion model i
n predicting the percentage body far of 72 white and 40 African American gi
rls aged 13.0 +/- 1.9 y.
Design: The biceps, triceps, suprailiac, subscapular, thigh, calf, and abdo
minal skinfold thicknesses of the subjects were measured with skinfold cali
pers and the buttocks circumference with a metal tape. The percentage fat m
ass (%FM) predicted by using each skinfold-thickness equation was compared
with the criterion value calculated by the 4-compartment model on the basis
of measurements of body density, body water, and bone mineral content.
Results: When the racial groups were analyzed separately, the Bland-Altman
analysis indicated that the quadratic equations agreed most closely with th
e 4-compartment model's measurement of %FM. Agreement of the other equation
s varied with body fatness.
Conclusions: The quadratic equation of Slaughter et al is recommended for p
opulation studies in female adolescents because of its accuracy and simplic
ity. However, an individual %FM can be over- or underestimated by approxima
te to 10% when this skinfold-thickness equation is used.