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. 2017 Aug 10;7:7846. doi: 10.1038/s41598-017-08255-9

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© The Author(s) 2017

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Histograms of the density of relative-frequency for values E for 19^th and 33^th days of PRBC storage and their approximation by the normal Gaussian distribution law. The density of relative frequencies is plotted along the ordinate axis, and the values of E is plotted along the abscissa axis. (a) 19–01 HR – 19^th storage day, after 1 hour of rotation, 33–01 HR - 33^th storage day, after 1 hour of rotation (^**p < 0.01, differences are statistically significant). (b) 19–12 HR- 19^th storage day, after 12 hour of rotation, 33–12 HR-33 days of storage, after 12 hours rotation (^**p < 0.01, differences are statistically significant). (c) 19–01 HR and 19–12 HR - 19 days of storage, after 01 hour and 12 hours of rotation respectively (^**p < 0.01, differences are statistically significant).(d) 33–01 HR and 33–12 HR - 33 days of storage, after 01 hour and 12 hours of rotation respectively (differences are not statistically significant). E_m – the mean value of Young’s modulus, σ - the standard deviation.