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. 2021 Jul 13;11:14410. doi: 10.1038/s41598-021-93769-6

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© The Author(s) 2021

Open AccessThis 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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Figure (a–d) shows the cumulative resistance. (a,b) are the mean cavity resistance distribution of all 10 subjects along the cavity centerline before and after decongestion, respectively. (c,d) shows the same but for flowrate at 30 L.min $^{- 1}$ . The boxplots (e,f) show the effect of decongestant on the total nasal resistance at 15 L.min $^{- 1}$ and 30 L.min $^{- 1}$ . The results show that decongestion can significantly reduce nasal resistance for both at 15 L.min $^{- 1}$ and 30 L.min $^{- 1}$ .