Development and validation of a simple equation to fat mass and percentage of body fat in children and adolescents

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Asadi Maryam; Zare Javid Ahmad; Kazemi Parvaneh; Sharifat Morteza; Samadani Mahsa; Bavi Behbahani Hossein

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Journal Paper

Paper Information

Journal: Journal of Kerman University of Medical Sciences Year:2024 | Volume:31 | Issue:1 Page(s): 8-16

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Title

Development and validation of a simple equation to fat mass and percentage of body fat in children and adolescents

Author(s)

Keywords

percentage of body fatQ4

Fat MassQ4

predictiveQ4

equationQ4

childrenQ4

adolescentsQ4

Abstract

Background: The purpose of this study was to development and validation of a simple equation to Fat Mass (FM) and percentage of body fat (PBF) in children and adolescents.Methods: Participants were 404 (176 boys and 228 girls) children and adolescents (5 to18 years old) that were randomly divided into Derivation (n = 279) and Validation (n= 125) groups. FM and PBF were measured by Bioelectrical Impedance Analyzer. Based on demographic variables retrieved from the Derivation group, 10 FM and 10 PBF predictive equations were developed using multiple regression. Finally, the most accurate model (using the coefficient of determination (R2)) was chosen and then validated on the validation group.Results: The best equations of FM and PBF, which were derived from demographic characteristics, were:FM (kg) = Weight (Kg) x 0.15 + BMI x 1.53 + Sex x 3.40 – Age (years) x 0.37 – 26.20; where sex = 1 for male and 0 for female. R=0.97, R^2=0.94, standard error of the estimate = 3.74 Kg.PBF (kg) = 0.31 x Height (cm) - Weight (Kg) x 0.59 + BMI x 2.98 + Sex x 6.17 – Age (years) x 0.76 – 52.84; where sex = 1 for male and 0 for female. R=0.90, R^2=0.82, standard error of the estimate = 4.88 Kg.Conclusions: Our predictive equations accurately predicted FM and PBF using simple parameters (Height, Weight, BMI, sex and age) in children and adolescents.

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