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Dual-energy X-ray absorptiometry (DXA) has been considered a reference method for measuring body fat percentage (BF%) in children and adolescents with an excess of adiposity. However, given that the DXA technique is impractical for routine field use, there is a need to investigate other methods that can accurately determine BF%. We studied the accuracy of bioelectrical impedance analysis (BIA) technology, including foot-to-foot and hand-to-foot impedance, and Slaughter skinfold-thickness equations in the measurement of BF%, compared with DXA, in a population of Latin American children and adolescents with an excess of adiposity. A total of 127 children and adolescents (11⁻17 years of age; 70% girls) from the HEPAFIT (Exercise Training and Hepatic Metabolism in Overweight/Obese Adolescent) study were included in the present work. BF% was measured on the same day using two BIA analysers (Seca ® 206, Allers Hamburg, Germany and Model Tanita ® BC-418 ® , TANITA Corporation, Sportlife Tokyo, Japan), skinfold measurements (Slaughter equation), and DXA (Hologic Horizon DXA System ® , Quirugil, Bogotá, Columbia). Agreement between measurements was analysed using t -tests, Bland⁻Altman plots, and Lin's concordance correlation coefficient ( ρ c). There was a significant correlation between DXA and the other BF% measurement methods ( r &gt; 0.430). According to paired t -tests, in both sexes, BF% assessed by BIA analysers or Slaughter equations differ from BF% assessed by DXA ( p &lt; 0.001). The lower and upper limits of the differences compared with DXA were 6.3⁻22.9, 2.2⁻2.8, and -3.2⁻21.3 (95% CI) in boys and 2.3⁻14.8, 2.4⁻20.1, and 3.9⁻18.3 (95% CI) in girls for Seca ® mBCA, Tanita ® BC 420MA, and Slaughter equations, respectively. Concordance was poor between DXA and the other methods of measuring BF% ( ρ c &lt; 0.5). BIA analysers and Slaughter equations underestimated BF% measurements compared to DXA, so they are not interchangeable methods for assessing BF% in Latin American children and adolescents with excess of adiposity.

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Comparison of Bioelectrical Impedance Analysis, Slaughter Skinfold-Thickness Equations, and Dual-Energy X-ray Absorptiometry for Estimating Body Fat Percentage in Colombian Children and Adolescents with Excess of Adiposity