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Trends in Excess Winter Mortality (EWM) from 1900/01 to 2019/20—Evidence for a Complex System of Multiple Long-Term Trends

Author

Listed:
  • Rodney P. Jones

    (Healthcare Analysis & Forecasting, Wantage OX12 0NE, UK)

  • Andriy Ponomarenko

    (Department of Biophysics, Informatics and Medical Instrumentation, Odessa National Medical University, Valikhovsky Lane 2, 65082 Odessa, Ukraine)

Abstract

Trends in excess winter mortality (EWM) were investigated from the winter of 1900/01 to 2019/20. During the 1918–1919 Spanish flu epidemic a maximum EWM of 100% was observed in both Denmark and the USA, and 131% in Sweden. During the Spanish flu epidemic in the USA 70% of excess winter deaths were coded to influenza. EWM steadily declined from the Spanish flu peak to a minimum around the 1960s to 1980s. This decline was accompanied by a shift in deaths away from the winter and spring, and the EWM calculation shifted from a maximum around April to June in the early 1900s to around March since the late 1960s. EWM has a good correlation with the number of estimated influenza deaths, but in this context influenza pandemics after the Spanish flu only had an EWM equivalent to that for seasonal influenza. This was confirmed for a large sample of world countries for the three pandemics occurring after 1960. Using data from 1980 onward the effect of influenza vaccination on EWM were examined using a large international dataset. No effect of increasing influenza vaccination could be discerned; however, there are multiple competing forces influencing EWM which will obscure any underlying trend, e.g., increasing age at death, multimorbidity, dementia, polypharmacy, diabetes, and obesity—all of which either interfere with vaccine effectiveness or are risk factors for influenza death. After adjusting the trend in EWM in the USA influenza vaccination can be seen to be masking higher winter deaths among a high morbidity US population. Adjusting for the effect of increasing obesity counteracted some of the observed increase in EWM seen in the USA. Winter deaths are clearly the outcome of a complex system of competing long-term trends.

Suggested Citation

  • Rodney P. Jones & Andriy Ponomarenko, 2022. "Trends in Excess Winter Mortality (EWM) from 1900/01 to 2019/20—Evidence for a Complex System of Multiple Long-Term Trends," IJERPH, MDPI, vol. 19(6), pages 1-24, March.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:6:p:3407-:d:770662
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    References listed on IDEAS

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    1. Thompson, W.W. & Moore, M.R. & Weintraub, E. & Cheng, P.-Y. & Jin, X. & Bridges, C.B. & Bresee, J.S. & Shay, D.K., 2009. "Estimating influenza-associated deaths in the United States," American Journal of Public Health, American Public Health Association, vol. 99(S2), pages 225-230.
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