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. 2021 Aug 20;11:16984. doi: 10.1038/s41598-021-96207-9

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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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Average coefficient of variation of the ratio between RnC_WH and RnC_H24 (R_WH/_h24) estimated for each 7-day, 14- day, 30-day, and 90-day period of the year for the 11 rooms for which annual radon measurements with active devices were performed. On the x-axis, the average annual radon concentrations for these 11 rooms are reported.