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Mortality in Norway and Sweden during the COVID-19 pandemic 2020-22 : A comparative study
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- Zahl, Per-Henrik (author)
- Norwegian Inst Publ Hlth, Div Mental & Phys Hlth, Oslo, Norway.
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- Hemström, Örjan (author)
- Mälardalens universitet,Hälsa och välfärd,Social Statistics and Analysis Population and Living Conditions, Statistics Sweden, Solna, Sweden
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- Johansen, Rune (author)
- Norwegian Inst Publ Hlth, Div Mental & Phys Hlth, Oslo, Norway.
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- Norwegian Inst Publ Hlth, Div Mental & Phys Hlth, Oslo, Norway Hälsa och välfärd (creator_code:org_t)
- ELSEVIER SCIENCE LONDON, 2024
- 2024
- English.
- In: Journal of Infection and Public Health. - : ELSEVIER SCIENCE LONDON. - 1876-0341 .- 1876-035X. ; 17:4, s. 719-726
- Journal article (peer-reviewed)
Abstract
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- Background: Norway and Sweden picked two different ways to mitigate the dissemination of the SARS-CoV2 virus. Norway introduced the strictest lockdown in Europe with strict border controls and intense virus tracking of all local outbreaks while Sweden did not. That resulted in 477 COVID-19 deaths (Norway) and 9737 (Sweden) in 2020, respectively. Methods: Weekly number of COVID-19 related deaths and total deaths for 2020-22 were collected as well as weekly number of deaths for 2015-19 which were used as controls when calculating excess mortality. During the first 12-18 months with high rate of virus transmission in the society, excess mortality rates were used as substitute for COVID-19 deaths. When excess mortality rates later turned negative because of mortality displacement, COVID-19 deaths adjusted for bias due to overreporting were used. Results: There were 17521 COVID-19 deaths in Sweden and 4272 in Norway in the study period. The rate ratio (RR) of COVID-19 related deaths in Sweden vs. Norway to the end of week 43, 2022, was 2.11 (95% CI 2.05-2.19). RR of COVID-19 related deaths vs. excess number of deaths were 2.5 (Sweden) and 1.3 (Norway), respectively. RR of COVID-19 deaths in Sweden vs. Norway after adjusting for mortality displacement and lockdown, was 1.35 (95% CI 1.31-1.39), corresponding to saving 2025 life in Norway. If including all deaths in 2022, RR= 1.28 (95% CI 1.24-1.31). Conclusions: Both COVID-19 related mortality and excess mortality rates are biased estimates. When adjusting for bias, mortality differences declined over time to about 30% higher mortality in Sweden after 30 months with pandemics. (c) 2023 The Author(s). Published by Elsevier Ltd on behalf of King Saud Bin Abdulaziz University for Health Sciences. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/ 4.0/).
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Hälsovetenskap (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Health Sciences (hsv//eng)
Keyword
- COVID-19
- Excess mortality
- Norway
- Sweden
- Epidemics
- Public health
Publication and Content Type
- ref (subject category)
- art (subject category)
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