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. 2021 Jun 7;11:11906. doi: 10.1038/s41598-021-91479-7

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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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Radon knowledge perceptions differ by profession and sex but not age. Panel (A) Overall distribution of responses to indicated questions on self-perceptions of radon knowledge. Panel (B) Self-perceptions of radon knowledge as a function of sex. Panel (C) Self-perceptions of radon knowledge as a function of sex and age. Mean Age refers to a geometric mean ± CI_95%. Panel (D) Self-perceptions of radon knowledge as a function of status (worked or qualified) in professions with or without the potential for a specialist on radon. Panel (E) Self-perceptions of radon knowledge as a function of the first encounter with radon awareness information. Statistical comparisons are Mann–Whitney pairwise nonparametric t-tests of comparisons for scatter plot data or 1-way ANOVA for all other data. **** = p < 0.0001; *** = p < 0.001; * = p < 0.05; ns = p > 0.05. Figures were prepared using Excel and GraphPad Prism 9.1.1 (225) (www.graphpad.com).