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Risk factors for avoidable hospitalizations in Canada using national linked data: A retrospective cohort study

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  • Lauren E Wallar
  • Laura C Rosella

Abstract

Hospitalizations for certain chronic conditions are considered avoidable for adult Canadians given effective and timely primary care management. Individual-level risk factors such as income and health behaviours are not routinely collected in most hospital databases and as a result, are largely uncharacterized for avoidable hospitalization at the national level. The aim of this study was to identify and describe demographic, socioeconomic, and health behavioural risk factors for avoidable hospitalizations in Canada using linked data. A national retrospective cohort study was conducted by pooling eight cycles of the Canadian Community Health Survey (2000/2001-2011) and linking to hospitalization records in the Discharge Abstract Database (1999/2000–2012/2013). Respondents who were younger than 18 years and older than 74 years of age, residing in Quebec, or pregnant at baseline were excluded yielding a final cohort of 389,065 individuals. The primary outcome measure was time-to index avoidable hospitalization. Sex-stratified Cox proportional hazard models were constructed to determine effect sizes adjusted for various factors and their associated 95% confidence intervals. Demographics, socioeconomic status, and health behaviours are associated with risk of avoidable hospitalizations in males and females. In fully adjusted models, health behavioural variables had the largest effect sizes including heavy smoking (Male HR 2.65 (95% CI 2.17–3.23); Female HR 3.41 (2.81–4.13)) and being underweight (Male HR 1.98 (1.14–3.43); Female HR 2.78 (1.61–4.81)). Immigrant status was protective in both sexes (Male HR 0.83 (0.69–0.98); (Female HR 0.69 (0.57–0.84)). Adjustment for behavioural and clinical variables attenuated the effect of individual-level socioeconomic status. This study identified several risk factors for time-to-avoidable hospitalizations by sex, using the largest national database of linked health survey and hospitalization records. The larger effect sizes of several modifiable risk factors highlights the importance of prevention in addressing avoidable hospitalizations in Canada.

Suggested Citation

  • Lauren E Wallar & Laura C Rosella, 2020. "Risk factors for avoidable hospitalizations in Canada using national linked data: A retrospective cohort study," PLOS ONE, Public Library of Science, vol. 15(3), pages 1-21, March.
    • Handle: RePEc:plo:pone00:0229465
    DOI: 10.1371/journal.pone.0229465
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    References listed on IDEAS

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    1. Pappas, G. & Hadden, W.C. & Kozak, L.J. & Fisher, G.F., 1997. "Potentially avoidable hospitalizations: Inequalities in rates between US socioeconomic groups," American Journal of Public Health, American Public Health Association, vol. 87(5), pages 811-816.
    2. Laberge, Maude & Wodchis, Walter P. & Barnsley, Jan & Laporte, Audrey, 2017. "Hospitalizations for ambulatory care sensitive conditions across primary care models in Ontario, Canada," Social Science & Medicine, Elsevier, vol. 181(C), pages 24-33.
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    1. Nibene Habib Somé & Rose Anne Devlin & Nirav Mehta & Sisira Sarma, 2024. "Primary care payment models and avoidable hospitalizations in Ontario, Canada: A multivalued treatment effects analysis," Health Economics, John Wiley & Sons, Ltd., vol. 33(10), pages 2288-2305, October.

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