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Identifying hotspots of cardiometabolic outcomes based on a Bayesian approach: The example of Chile

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  • Gloria A Aguayo
  • Anna Schritz
  • Maria Ruiz-Castell
  • Luis Villarroel
  • Gonzalo Valdivia
  • Guy Fagherazzi
  • Daniel R Witte
  • Andrew Lawson

Abstract

Background: There is a need to identify priority zones for cardiometabolic prevention. Disease mapping in countries with high heterogeneity in the geographic distribution of the population is challenging. Our goal was to map the cardiometabolic health and identify hotspots of disease using data from a national health survey. Methods: Using Chile as a case study, we applied a Bayesian hierarchical modelling. We performed a cross-sectional analysis of the 2009–2010 Chilean Health Survey. Outcomes were diabetes (all types), obesity, hypertension, and high LDL cholesterol. To estimate prevalence, we used individual and aggregated data by province. We identified hotspots defined as prevalence in provinces significantly greater than the national prevalence. Models were adjusted for age, sex, their interaction, and sampling weight. We imputed missing data. We applied a joint outcome modelling approach to capture the association between the four outcomes. Results: We analysed data from 4,780 participants (mean age (SD) 46 (19) years; 60% women). The national prevalence (percentage (95% credible intervals) for diabetes, obesity, hypertension and high LDL cholesterol were 10.9 (4.5, 19.2), 30.0 (17.7, 45.3), 36.4 (16.4, 57.6), and 13.7 (3.4, 32.2) respectively. Prevalence of diabetes was lower in the far south. Prevalence of obesity and hypertension increased from north to far south. Prevalence of high LDL cholesterol was higher in the north and south. A hotspot for diabetes was located in the centre. Hotspots for obesity were mainly situated in the south and far south, for hypertension in the centre, south and far south and for high LDL cholesterol in the far south. Conclusions: The distribution of cardiometabolic risk factors in Chile has a characteristic pattern with a general trend to a north-south gradient. Our approach is reproducible and demonstrates that the Bayesian approach enables the accurate identification of hotspots and mapping of disease, allowing the identification of areas for cardiometabolic prevention.

Suggested Citation

  • Gloria A Aguayo & Anna Schritz & Maria Ruiz-Castell & Luis Villarroel & Gonzalo Valdivia & Guy Fagherazzi & Daniel R Witte & Andrew Lawson, 2020. "Identifying hotspots of cardiometabolic outcomes based on a Bayesian approach: The example of Chile," PLOS ONE, Public Library of Science, vol. 15(6), pages 1-16, June.
    • Handle: RePEc:plo:pone00:0235009
    DOI: 10.1371/journal.pone.0235009
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    References listed on IDEAS

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    4. Villalobos Dintrans, Pablo, 2018. "Out-of-pocket health expenditure differences in Chile: Insurance performance or selection?," Health Policy, Elsevier, vol. 122(2), pages 184-191.
    5. Ruiz-Castell, M. & Muckle, G. & Dewailly, E. & Jacobson, J.L. & Jacobson, S.W. & Ayotte, P. & Riva, M., 2015. "Household crowding and food insecurity among inuit families with school-aged children in the canadian arctic," American Journal of Public Health, American Public Health Association, vol. 105(3), pages 122-132.
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