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. 2021 Sep 16;11:18443. doi: 10.1038/s41598-021-97705-6

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Odds ratios for key covariates in the fractional logit model of fully vaccinated fractions among Illinois counties as of February 4, March 10, and April 3, 2021. The odds ratios for the control variables of population density, percent population age 65 and over, percent male population, and percent uninsured population are not shown; GOP = Republican.