Changing BMI scores among Canadian Indigenous and non-Indigenous children, youth, and young adults: Untangling age, period, and cohort effects

Authors

  • Piotr Wilk Western University
  • Alana Maltby Western University
  • Martin Cooke Waterloo University

DOI:

https://doi.org/10.25336/P6HK5D

Keywords:

age-period-cohort analysis, BMI, CCHS, Canada, obesity

Abstract

The objective of this study was to examine age, period and cohort effects on BMI among Indigenous and non-Indigenous populations, using repeated cross-sectional survey data from the CCHS (2001 to 2014). Cross-classified random-effect two-level models were used to estimate fixed effects for age and its quadratic term (Level 1), and also to estimate random effects for time periods and birth cohorts (Level 2), while controlling for the effects of Level 1 control variables: sex, model of interview and response by proxy. Overall, the results support the hypothesis that age and period effects are primarily responsible for the current obesity epidemic.

L’objectif de cette étude était d’examiner les effets de l’âge, de la période et de la cohorte sur l’IMC chez les populations autochtones et non autochtones, en utilisant des données d’enquêtes transversales répétées de l’ESCC (2001 à 2014). On a utilisé des modèles à deux niveaux à effets aléatoires croisés pour estimer les effets fixes pour l’âge et son terme quadratique (niveau 1), et également estimer les effets aléatoires pour les périodes et les cohortes de naissance (niveau 2), tout en contrôlant les effets du niveau 1 Variables de contrôle: sexe, modèle d’interview et réponse par procuration. Dans l’ensemble, les résultats confirment l’hypothèse selon laquelle les effets de l’âge et de la période sont les principaux responsables de l’épidémie actuelle d’obésité.

Author Biographies

Piotr Wilk, Western University

Department of Epidemiology & Biostatistics and Paediatrics, Western University, Kresge Building, Room K201, 1151 Richmond Street, London, Ontario, N6A 5C1 

Alana Maltby, Western University

Department of Epidemiology & Biostatistics, Western University, Kresge Building, Room K201, 1151 Richmond Street, London, Ontario, N6A 5C1 

Martin Cooke, Waterloo University

School of Public Health and Healthy Systems, University of Waterloo, PAS 2040, 200 University Ave West, Waterloo, Ontario N2L 3G1

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Published

2017-04-13

Issue

Vol. 44 No. 1-2 (2017): Special issue on FCD 2015 Conference

Section

Articles

License

Copyright (c) 2019 Piotr Wilk, Alana Maltby, Martin Cooke

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