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. 2021 Sep 2;11:17551. doi: 10.1038/s41598-021-96928-x

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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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Time series of innate radon risk in different types of Swedish and Canadian properties, as a function of period of construction. Geometric means ± CI_95% for 10-year periods of residential property construction for Sweden (blue line with hexagons) and Canada (red line with diamonds). Panel (A) includes all single family detached properties, as depicted in the inset cartoon. Panel (B) includes all semi-detached side-by-side (also called duplex, triplex or quadruplex) properties, as depicted in the inset cartoon. Panel (C) includes all semi-detached row-style properties, as depicted in the inset cartoon. Statistical comparisons are pairwise t-tests for Canada versus Swedish data for a specific decade of construction. **** = p < 0.0001; ns = p > 0.05. Figures were prepared using GraphPad Prism 9.1.1 (225) (www.graphpad.com).