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

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  • 1 University of Campinas
  • 2 Mississippi State University
  • 3 University of Alabama at Birmingham
  • 4 São Paulo State Federation of APAES
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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; R2 = .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 %BF with modest 95% confidence intervals. The prediction equation was %BF = 56.708 − (729.200 × [1/body mass index]) + (12.134 × sex). Health care professionals may use the prediction equation for monitoring %BF among young people with intellectual disability.

Bertapelli is with the School of Medical Sciences, University of Campinas, São Paulo, Brazil. Agiovlasitis is with Mississippi State University, Mississippi State, MS, USA. Motl is with the University of Alabama at Birmingham, Birmingham, AL, USA. Soares is with the São Paulo State Federation of APAES, Franca, São Paulo, Brazil. de Barros-Filho, do Amaral-Junior, and Guerra-Junior are with the University of Campinas, Campinas, Brazil.

Bertapelli (fbertapelli@gmail.com) is corresponding author.
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