Accuracy of Body Mass Index Cutoffs for Classifying Obesity in Chilean Children and Adolescents

Objective: To determine the accuracy of two international Body Mass Index (BMI) cut-offs for classifying obesity compared to the percentage of fat mass (%FM) assessed by Dual-Energy X-ray Absorptiometry (DXA) in a Chilean sample of children and adolescents; Material and Methods: The subjects studied...

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Main Authors: Rossana Gómez-Campos, Raquel David Langer, Roseane de Fátima Guimarães, Mariana Contiero San Martini, Marco Cossio-Bolaños, Miguel de Arruda, Gil Guerra-Júnior, Ezequiel Moreira Gonçalves
Format: Article
Language:English
Published: MDPI AG 2016-05-01
Series:International Journal of Environmental Research and Public Health
Subjects:
DXA
Online Access:http://www.mdpi.com/1660-4601/13/5/472
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spelling doaj-24292d2254db4f96be7688edaa5337f42020-11-25T00:01:28ZengMDPI AGInternational Journal of Environmental Research and Public Health1660-46012016-05-0113547210.3390/ijerph13050472ijerph13050472Accuracy of Body Mass Index Cutoffs for Classifying Obesity in Chilean Children and AdolescentsRossana Gómez-Campos0Raquel David Langer1Roseane de Fátima Guimarães2Mariana Contiero San Martini3Marco Cossio-Bolaños4Miguel de Arruda5Gil Guerra-Júnior6Ezequiel Moreira Gonçalves7Instituto de Actividad Física y Salud, Universidad Autonoma de Chile, 5 Poniente 1670, Talca, ChileGrowth and Development Lab, Center for Investigation in Pediatrics (CIPED), School of Medical Sciences, University of Campinas (UNICAMP), CEP 13083-887, Campinas-SP, BrazilGrowth and Development Lab, Center for Investigation in Pediatrics (CIPED), School of Medical Sciences, University of Campinas (UNICAMP), CEP 13083-887, Campinas-SP, BrazilGrowth and Development Lab, Center for Investigation in Pediatrics (CIPED), School of Medical Sciences, University of Campinas (UNICAMP), CEP 13083-887, Campinas-SP, BrazilFaculty of Physical Education, State University of Campinas, Avenida Érico Veríssimo, 701, Cidade Universitária Zeferino Vaz, Barão Geraldo, CEP 13083-851, Campinas, BrazilFaculty of Physical Education, State University of Campinas, Avenida Érico Veríssimo, 701, Cidade Universitária Zeferino Vaz, Barão Geraldo, CEP 13083-851, Campinas, BrazilGrowth and Development Lab, Center for Investigation in Pediatrics (CIPED), School of Medical Sciences, University of Campinas (UNICAMP), CEP 13083-887, Campinas-SP, BrazilGrowth and Development Lab, Center for Investigation in Pediatrics (CIPED), School of Medical Sciences, University of Campinas (UNICAMP), CEP 13083-887, Campinas-SP, BrazilObjective: To determine the accuracy of two international Body Mass Index (BMI) cut-offs for classifying obesity compared to the percentage of fat mass (%FM) assessed by Dual-Energy X-ray Absorptiometry (DXA) in a Chilean sample of children and adolescents; Material and Methods: The subjects studied included 280 children and adolescents (125 girls and 155 boys) aged 8 to 17 years. Weight and height were measured. The BMI was calculated. Two international references (IOFT and WHO) were used as cut-off points. The %FM was assessed by DXA. The receiver operating characteristic (ROC) curve was used to assess the performance of BMI in detecting obesity on the basis of %FM; Results: A high correlation was observed between the %FM measured by the DXA and the Z-scores of IOTF and WHO scores in the Chilean adolescents separated by sex (r = 0.78–0.80). Differences occurred in both references (IOFT and WHO) in relation to the criteria (p < 0.001). Both references demonstrated a good ability to predict sensitivity (between 84% and 93%) and specificity (between 83% and 88%) in both sexes of children and adolescents; Conclusions: A high correlation was observed between the Z-score of the BMI with the percentage of fat determined by the DXA. Despite this, the classifications using the different BMI cut-off points showed discrepancies. This suggests that the cut-off points selected to predict obesity in this sample should be viewed with caution.http://www.mdpi.com/1660-4601/13/5/472Body Mass IndexobesityDXAcut-off pointsChile
collection DOAJ
language English
format Article
sources DOAJ
author Rossana Gómez-Campos
Raquel David Langer
Roseane de Fátima Guimarães
Mariana Contiero San Martini
Marco Cossio-Bolaños
Miguel de Arruda
Gil Guerra-Júnior
Ezequiel Moreira Gonçalves
spellingShingle Rossana Gómez-Campos
Raquel David Langer
Roseane de Fátima Guimarães
Mariana Contiero San Martini
Marco Cossio-Bolaños
Miguel de Arruda
Gil Guerra-Júnior
Ezequiel Moreira Gonçalves
Accuracy of Body Mass Index Cutoffs for Classifying Obesity in Chilean Children and Adolescents
International Journal of Environmental Research and Public Health
Body Mass Index
obesity
DXA
cut-off points
Chile
author_facet Rossana Gómez-Campos
Raquel David Langer
Roseane de Fátima Guimarães
Mariana Contiero San Martini
Marco Cossio-Bolaños
Miguel de Arruda
Gil Guerra-Júnior
Ezequiel Moreira Gonçalves
author_sort Rossana Gómez-Campos
title Accuracy of Body Mass Index Cutoffs for Classifying Obesity in Chilean Children and Adolescents
title_short Accuracy of Body Mass Index Cutoffs for Classifying Obesity in Chilean Children and Adolescents
title_full Accuracy of Body Mass Index Cutoffs for Classifying Obesity in Chilean Children and Adolescents
title_fullStr Accuracy of Body Mass Index Cutoffs for Classifying Obesity in Chilean Children and Adolescents
title_full_unstemmed Accuracy of Body Mass Index Cutoffs for Classifying Obesity in Chilean Children and Adolescents
title_sort accuracy of body mass index cutoffs for classifying obesity in chilean children and adolescents
publisher MDPI AG
series International Journal of Environmental Research and Public Health
issn 1660-4601
publishDate 2016-05-01
description Objective: To determine the accuracy of two international Body Mass Index (BMI) cut-offs for classifying obesity compared to the percentage of fat mass (%FM) assessed by Dual-Energy X-ray Absorptiometry (DXA) in a Chilean sample of children and adolescents; Material and Methods: The subjects studied included 280 children and adolescents (125 girls and 155 boys) aged 8 to 17 years. Weight and height were measured. The BMI was calculated. Two international references (IOFT and WHO) were used as cut-off points. The %FM was assessed by DXA. The receiver operating characteristic (ROC) curve was used to assess the performance of BMI in detecting obesity on the basis of %FM; Results: A high correlation was observed between the %FM measured by the DXA and the Z-scores of IOTF and WHO scores in the Chilean adolescents separated by sex (r = 0.78–0.80). Differences occurred in both references (IOFT and WHO) in relation to the criteria (p < 0.001). Both references demonstrated a good ability to predict sensitivity (between 84% and 93%) and specificity (between 83% and 88%) in both sexes of children and adolescents; Conclusions: A high correlation was observed between the Z-score of the BMI with the percentage of fat determined by the DXA. Despite this, the classifications using the different BMI cut-off points showed discrepancies. This suggests that the cut-off points selected to predict obesity in this sample should be viewed with caution.
topic Body Mass Index
obesity
DXA
cut-off points
Chile
url http://www.mdpi.com/1660-4601/13/5/472
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