Abstract
Estimation of thickness of subcutabeous folds (SqF) is a simple way to estimate body composition in children, although it has its limitations. Double photon densitometry (DXA) is considered a new standard.
Objective: To compare the precision of estimation of body fat by SqF and DXA in a population of chilean children.
Patients and Methods: Body fat was estimated in 128 eutrophic healthy children (70 females, 58 males), between 2 and 18 y.o. through SqF equations and DXA. Differences between both methods were evaluated through the Bland and Altman method and Lin concordance coefficient.
Results: Most SqF equations had poor concordance with DXA. There was better concordance if the Westrate and Deurenberg equation was used among prepuberal and children of all ages (average difference of 2,96 ± 1,20% and 4,92 ± 0,98% and Lin concordance index of 0,50 ± 0,22 and 0,43 ± 0,88, respectively).
Conclusions: Body fat estimated through subcutaneous fold measurements is poorly correlated with double photon densitometry among chilean children. However, until more precise equations are developed, Westrate and Deurenberg for all ages, and Westrate/Deurenberg specific for pre-puberal age can be used.
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