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. 2021 Dec;36(12):1225-1229.
doi: 10.1007/s10654-021-00830-9. Epub 2021 Dec 24.

Revival of ecological studies during the COVID-19 pandemic

Jonas Björk  1   2 , Karin Modig  3 , Fredrik Kahn  4 , Anders Ahlbom  5   6
Affiliations

Revival of ecological studies during the COVID-19 pandemic

Jonas Björk et al. Eur J Epidemiol. 2021 Dec.
No abstract available

PubMed Disclaimer

Conflict of interest statement

The authors have no relevant financial or non-financial interests to disclose.

Figures

Fig. 1
Fig. 1
The association between the proportion of fully vaccinated and COVID-19 cases per 100 000 people in the last 7 days as of September 2, 2021 across (a) 2947 counties (b) 50 states in the US (Texas excluded due to missing data). The area of each bubble is proportional to population size
Fig. 2
Fig. 2
The association between the proportion of fully vaccinated and COVID-19 cases per 100 000 people in the last 7 days as of September 2, 2021 across counties in (a) Florida (b) Georgia. The area of each bubble is proportional to population size
See this image and copyright information in PMC

References

    1. Ahlbom A. Epidemiology is about disease in populations. Eur J Epidemiol. 2020;35(12):1111–3. doi: 10.1007/s10654-020-00701-9. - DOI - PMC - PubMed
    1. Keys A. A multivariate analysis of death and coronary disease. Cambridge: Harvard University Press; 1980.
    1. MacMahon B, Lin TM, Lowe CR, et al. Lactation and cancer of the breast. A summary of an international study. Bull World Health Organ. 1970;42(2):185–94. - PMC - PubMed
    1. Stamler J. The INTERSALT Study: background, methods, findings, and implications. Am J Clin Nutr. 1997;65(2 Suppl):s626–42. doi: 10.1093/ajcn/65.2.626S. - DOI - PubMed
    1. Lopez Bernal JA, Andrews N, Amirthalingam G. The use of quasi-experimental designs for vaccine evaluation. Clin Infect Dis : Off Publ Infect Dis Soc Am. 2019;68(10):1769–1776. doi: 10.1093/cid/ciy906. - DOI - PubMed