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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Estimation of body fat in children with intellectual disability: development and cross-validation of a simple anthropometric method

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Author(s):
Fabio Bertapelli [1] ; Stamatis Agiovlasitis [2] ; Robert W. Motl [3] ; Marcos M. de Barros-Filho [4] ; Gil Guerra-Junior [5]
Total Authors: 5
Affiliation:
[1] Universidade de Campinas. Faculdade de Ciências Médicas - Brasil
[2] Mississippi State University. Department of Kinesiology - Estados Unidos
[3] University of Alabama at Birmingham. Department of Physical Therapy - Estados Unidos
[4] Universidade de Campinas. Faculdade de Ciências Médicas - Brasil
[5] Universidade de Campinas. Faculdade de Ciências Médicas - Brasil
Total Affiliations: 5
Document type: Journal article
Source: Jornal de Pediatria; v. 98, n. 5, p. 519-525, 2022-10-24.
Abstract

Abstract Objective Population-level monitoring of body composition requires accurate, biologically-relevant, yet feasible methods for estimating percent body fat (%BF). The aim of this study was to develop and cross-validate an equation for %BF from Body Mass Index (BMI), age, and sex among children with intellectual disability (ID). This study further aimed to examine the performance of an existing BMI-based equation (Deurenberg equation) for %BF in children with ID. Method Participants were 107 children (63 boys; aged 6-15 years) with ID randomly allocated to development (n= 81) and cross-validation (n= 26) samples. Dual-Energy X-Ray Absorptiometry provided the criterion %BF. Results The model including BMI, age, and sex (0 = male; 1 = female) had a significant goodness-of-fit in determining %BF (p< 0.001; R2= 0.69; SEE =5.68%). The equation was: %BF = - 15.416 + (1.394 × BMI) + (4.538 × age) - (0.262 × age2) + (5.489 × sex). The equation was cross-validated in the separate sample based on (i) strong correlation (r = 0.82; p< 0.001) and non-significant differences between actual and predicted %BF (28.6 ± 9.6% and 30.1 ± 7.1%, respectively); (ii) mean absolute error (MAE) = 4.4%; and (iii) reasonable %BF estimations in Bland-Altman plot (mean: 1.48%; 95% CI: 12.5, -9.6). The Deurenberg equation had a large %BF underestimation (mean: -7.1%; 95% CI: 5.3, -19.5), significant difference between actual and estimated %BF (28.6 ± 9.7% and 21.5 ± 7.0%, respectively; p< 0.001), and MAE = 8.1%. Conclusions The developed equation with BMI, sex, and age provides valid %BF estimates for facilitating population-level body fat screening among children with ID. (AU)

FAPESP's process: 19/07103-6 - Patterns and Determinants of Growth and Body Composition in Children and Adolescents with Intellectual Disability
Grantee:Fábio Bertapelli
Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
FAPESP's process: 18/02677-1 - Association between levels of physical activity, body composition and motor proficiency in adolescents with intellectual disability
Grantee:Marcos Martins de Barros Filho
Support Opportunities: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 17/13071-4 - Patterns and determinants of growth and body composition in children and adolescents with intellectual disability
Grantee:Fábio Bertapelli
Support Opportunities: Scholarships in Brazil - Post-Doctorate