4.2 Article

Sensitivity Analysis of Excess Mortality due to the COVID-19 Pandemic

Journal

POPULATION AND DEVELOPMENT REVIEW
Volume 48, Issue 2, Pages 279-302

Publisher

WILEY
DOI: 10.1111/padr.12475

Keywords

country comparison; COVID-19; excess mortality

Funding

  1. Volkswagen Foundation
  2. Basic Research Program of the National Research University Higher School of Economics
  3. Projekt DEAL

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Estimating excess mortality is challenging due to variations in expected mortality levels based on different choices. Our study shows that the estimates can vary substantially depending on factors such as the mortality index and method chosen, with country-specific variations leading to changes in rankings.
Estimating excess mortality is challenging. The metric depends on the expected mortality level, which can differ based on given choices, such as the method and the time series length used to estimate the baseline. However, these choices are often arbitrary, and are not subject to any sensitivity analysis. We bring to light the importance of carefully choosing the inputs and methods used to estimate excess mortality. Drawing on data from 26 countries, we investigate how sensitive excess mortality is to the choice of the mortality index, the number of years included in the reference period, the method, and the time unit of the death series. We employ two mortality indices, three reference periods, two data time units, and four methods for estimating the baseline. We show that excess mortality estimates can vary substantially when these factors are changed, and that the largest variations stem from the choice of the mortality index and the method. We also find that the magnitude of the variation in excess mortality is country-specific, resulting in cross-country rankings changes. Finally, based on our findings, we provide guidelines for estimating excess mortality.

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