1. Cohort profile: EFTER-COVID - a Danish nationwide cohort for assessing the long-term health effects of the COVID-19 pandemic.
- Author
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Sørensen AIV, Bager P, Nielsen NM, Koch A, Spiliopoulos L, Hviid A, and Ethelberg S
- Subjects
- Humans, Middle Aged, COVID-19 Testing, Denmark, Cohort Studies, Male, Female, Adolescent, Young Adult, Adult, Aged, 80 and over, COVID-19 diagnosis, COVID-19 epidemiology, COVID-19 pathology, Surveys and Questionnaires, Post-Acute COVID-19 Syndrome epidemiology, Post-Acute COVID-19 Syndrome pathology
- Abstract
Purpose: To follow SARS-CoV-2-infected persons up to 18 months after a positive test in order to assess the burden and nature of post acute symptoms and health problems., Participants: Persons in Denmark above 15 years of age, who were tested positive for SARS-CoV-2 during 1 September 2020 to 21 February 2023 using a RT-PCR test. As a reference group, three test-negative individuals were selected for every two test-positive individuals by matching on test date., Findings to Date: In total, 2 427 913 invitations to baseline questionnaires have been sent out and 839 528 baseline questionnaires (34.5%) have been completed. Females, the age group 50-69 years, Danish-born and persons, who had received at least one SARS-CoV-2 vaccination booster dose were more likely to participate. Follow-up questionnaires were sent at 2, 4, 6, 9, 12 and 18 months after the test, with response rates at 42%-54%., Future Plans: New participants have been recruited on a daily basis from 1 August 2021 to 23 March 2023. Data collection will continue until the last follow-up questionnaires (at 18 months after test) have been distributed in August 2024., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2024. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.)
- Published
- 2024
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