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. 2023 Aug 22;52(6):1716–1724. doi: 10.1093/ije/dyad114

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© The Author(s) 2023. Published by Oxford University Press on behalf of the International Epidemiological Association.

This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs licence (https://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial reproduction and distribution of the work, in any medium, provided the original work is not altered or transformed in any way, and that the work is properly cited. For commercial re-use, please contact journals.permissions@oup.com

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Figure 3. — The adjusted hazard ratio (aHR) estimates for COVID-19-associated (A) hospitalization and (B) intensive care unit admission by vaccination with an mRNA booster among all individuals living in Norway with a valid national identity number and aged ≥75 years. Fourth dose, >7 days after a fourth COVID-19 vaccine dose was given with either a monovalent or bivalent (BA.1 or BA.4–5) vaccine. The results of the Cox proportional hazard model are stratified for age, sex, risk group, resident in a long-term care facility and county of residence. Due to the recent introduction of the BA.1 and BA.4–5 vaccines, estimates could only be calculated for the monovalent vaccines