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Risk factors for COVID-19 in-hospital mortality in Argentina: A competing risk survival analysis

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  • Sebastian Calonico
  • Juan Cruz Lopez Del Valle
  • Rafael Di Tella

Abstract

COVID-19 poses dire threats for low and middle-income countries (LMICs). Yet, there remains limited rigorous evidence describing the characteristics and outcomes of hospitalized patients for LMICs, and often the evidence was based on small samples and/or unicentric. The objective of this study was to examine risk factors of COVID-19 mortality in Argentina, a hard-hit middle-income Latin American country. We analyze data on 5,146 COVID-19 patients from 11 centers across 10 cities in Argentina, making this one of the largest multi-centric retrospective observational descriptive studies in the LMICs. Information on demographics and co-morbidities was extracted from medical records. Outcomes of relevance consisted of whether the patient was discharged or deceased (as established in medical records), along with date of each event. We use survival models that account for competing risks. Median age was 60 years (IQR: 48–72), there were fewer women (40.8%) hospitalized than men (59.2%), and the most prevalent comorbidities were hypertension (40.9%), diabetes (20.0%) and obesity (19.1%). Patients were hospitalized for a median duration of 8 days (IQR: 5–13), and in-hospital mortality was 18.1%, though it varied substantially across health centers (95%CI: 17.1%-19.2%). Baseline characteristics most associated with in-hospital mortality were respiratory rate (adjusted HR = 3.6, 95%CI: 2.5–5.4 for ≥ 26 breathes/min), older age (adjusted HR = 2.5, 95%CI: 2.0–3.3 for the 80+ age group), and chronic kidney disease (adjusted HR = 2.2, 95%CI: 1.8–2.8). Associations were attenuated when survival models did not account for the competing risk of being discharged. We document lower mortality rates than those in prior studies, likely due to a lower prevalence of comorbidities amongst patients in our sample. Compared with standard Cox models, we find that, when using competing risk models, risk factors have a larger role in explaining COVID-19 mortality. Overall, we provide rigorous evidence describing the characteristics and outcomes of hospitalized patients for LMICs. Thus, our findings are useful to conduct a more accurate in-hospital monitoring of patient subgroups who may be at greater risk. They also provide valuable guidance for public health and policy efforts in Argentina and other developing countries.

Suggested Citation

  • Sebastian Calonico & Juan Cruz Lopez Del Valle & Rafael Di Tella, 2024. "Risk factors for COVID-19 in-hospital mortality in Argentina: A competing risk survival analysis," PLOS Global Public Health, Public Library of Science, vol. 4(1), pages 1-16, January.
  • Handle: RePEc:plo:pgph00:0000816
    DOI: 10.1371/journal.pgph.0000816
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    References listed on IDEAS

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    1. Eduardo Levy Yeyati & Luca Sartorio, 2020. "Take me out: De facto limits on strict lockdowns in developing countries," School of Government Working Papers 20200801, Universidad Torcuato Di Tella.
    2. Elizabeth J. Williamson & Alex J. Walker & Krishnan Bhaskaran & Seb Bacon & Chris Bates & Caroline E. Morton & Helen J. Curtis & Amir Mehrkar & David Evans & Peter Inglesby & Jonathan Cockburn & Helen, 2020. "Factors associated with COVID-19-related death using OpenSAFELY," Nature, Nature, vol. 584(7821), pages 430-436, August.
    3. Eduardo Levy Yeyati & Luca Sartorio, 2020. "Take me out: De facto limits on strict lockdowns in developing countries," Department of Economics Working Papers wp_gob_2020_08, Universidad Torcuato Di Tella.
    4. Eduardo Levy Yeyati & Luca Sartorio, 2020. "Take me out: De facto limits on strict lockdowns in developing countries," School of Government Working Papers 20200801, Universidad Torcuato Di Tella.
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