Development and Cross-Validation of a Prediction Equation for Estimating Percentage Body Fat From Body Mass Index in Young People With Intellectual Disability

Author(s)

Bertapelli, Fabio ^[1] ; Agiovlasitis, Stamatis ^[2] ; Motl, Robert W. ^[3] ; Soares, Roberto A. ^[4] ; De Barros-Filho, Marcos M. ^[5] ; Amaral-Junior, Wilson D. ^[5] ; Guerra-Junior, Gil ^[5]

Affiliation

^[1] Univ Estadual Campinas, Sch Med Sci, Sao Paulo - Brazil

^[2] Mississippi State Univ, Mississippi State, MS 39762 - USA

^[3] Univ Alabama Birmingham, Birmingham, AL - USA

^[4] Sao Paulo State Federat APAES, Franca, SP - Brazil

^[5] Univ Estadual Campinas, Campinas, SP - Brazil

• Document type: Journal article
• Source: ADAPTED PHYSICAL ACTIVITY QUARTERLY; v. 37, n. 4, p. 481-497, OCT 2020.
• Web of Science Citations: 0

Abstract

The purpose of this study was to develop and cross-validate an equation for estimating percentage body fat (%BF) from body mass index and other potential independent variables among young persons with intellectual disability. Participants were 128 persons with intellectual disability (62 women; age 16-24 years) split between development (n = 98) and cross-validation (n = 30) samples. Dual-energy X-ray absorptiometry served as the reference method for %BF. An equation including 1/body mass index and sex (0 = male; 1 = female) was highly accurate in estimating %BF (p <.001; R-2 =.82; standard error of estimate = 5.22%). Mean absolute and root mean square errors were small (3.1% and 3.9%, respectively). A Bland-Altman plot indicated nearly zero mean difference between actual and predicted%BFwith modest 95% confidence intervals. The prediction equation was %BF = 56.708 - (729.200 x {[}1/body mass index]) + (12.134 x sex). Health care professionals may use the prediction equation for monitoring%BFamong young peoplewith intellectual disability. (AU)

• 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-Doctoral
• 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: 18/02795-4 - Patterns and determinants of overweight in children and adolescents with intellectual disability
• Grantee: Wilson Domingues Do Amaral Junior
• Support Opportunities: Scholarships in Brazil - Scientific Initiation