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

Author

Listed:
  • Rossana Gómez-Campos

    (Instituto de Actividad Física y Salud, Universidad Autonoma de Chile, 5 Poniente 1670, Talca, Chile
    Faculty of Physical Education, State University of Campinas, Avenida Érico Veríssimo, 701, Cidade Universitária Zeferino Vaz, Barão Geraldo, CEP 13083-851, Campinas, Brazil
    Department of Research, Universidad Científica del Sur, Panamericana Sur Km 19 Villa, Lima, Perú)

  • Raquel David Langer

    (Growth and Development Lab, Center for Investigation in Pediatrics (CIPED), School of Medical Sciences, University of Campinas (UNICAMP), CEP 13083-887, Campinas-SP, Brazil)

  • Roseane De Fátima Guimarães

    (Growth and Development Lab, Center for Investigation in Pediatrics (CIPED), School of Medical Sciences, University of Campinas (UNICAMP), CEP 13083-887, Campinas-SP, Brazil)

  • Mariana Contiero San Martini

    (Growth and Development Lab, Center for Investigation in Pediatrics (CIPED), School of Medical Sciences, University of Campinas (UNICAMP), CEP 13083-887, Campinas-SP, Brazil)

  • Marco Cossio-Bolaños

    (Faculty of Physical Education, State University of Campinas, Avenida Érico Veríssimo, 701, Cidade Universitária Zeferino Vaz, Barão Geraldo, CEP 13083-851, Campinas, Brazil
    Department of Physical Activity Sciences, Catholic University of Maule, Av. San Miguel 3605, Talca, Chile
    Research Network on Human Biological Development, Urb. Amauta C-6, Jose Luis Bustamante y Rivero, Arequipa, Peru)

  • Miguel De Arruda

    (Faculty of Physical Education, State University of Campinas, Avenida Érico Veríssimo, 701, Cidade Universitária Zeferino Vaz, Barão Geraldo, CEP 13083-851, Campinas, Brazil)

  • Gil Guerra-Júnior

    (Growth and Development Lab, Center for Investigation in Pediatrics (CIPED), School of Medical Sciences, University of Campinas (UNICAMP), CEP 13083-887, Campinas-SP, Brazil)

  • Ezequiel Moreira Gonçalves

    (Growth and Development Lab, Center for Investigation in Pediatrics (CIPED), School of Medical Sciences, University of Campinas (UNICAMP), CEP 13083-887, Campinas-SP, Brazil)

Abstract

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.

Suggested Citation

  • 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, 2016. "Accuracy of Body Mass Index Cutoffs for Classifying Obesity in Chilean Children and Adolescents," IJERPH, MDPI, vol. 13(5), pages 1-9, May.
    • Handle: RePEc:gam:jijerp:v:13:y:2016:i:5:p:472-:d:69515
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    References listed on IDEAS

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    1. Marco Cossio-Bolaños & Rossana Gómez Campos & Cynthia Lee Andruske & Antonio Viveros Flores & Cristian Luarte-Rocha & Pedro R. Olivares & Javier Garcia-Rubio & Miguel De Arruda, 2015. "Physical Growth, Biological Age, and Nutritional Transitions of Adolescents Living at Moderate Altitudes in Peru," IJERPH, MDPI, vol. 12(10), pages 1-13, September.
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    Cited by:

    1. Theodosia Adom & André Pascal Kengne & Anniza De Villiers & Rose Boatin & Thandi Puoane, 2019. "Diagnostic Accuracy of Body Mass Index in Defining Childhood Obesity: Analysis of Cross-Sectional Data from Ghanaian Children," IJERPH, MDPI, vol. 17(1), pages 1-11, December.

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