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. 2023 Dec 16;13:22429. doi: 10.1038/s41598-023-49808-5

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© The Author(s) 2023

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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The Bland–Altman plot of the SI (QCA versus routine method). Of the adopted sites of cortisol concentration measurement, samples that were lower than the upper limit of the QCA and routine method were used to calculate the SI and were used to plot the Bland–Altman plot (n = 242). The purple/red line represents a 95% confidence interval. The Green line represents the mean value.