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. 2023 Jun 27;165(8):2227–2235. doi: 10.1007/s00701-023-05681-9

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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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Fig. 4 — The correlation plots for the spectral amplitude of spontaneous tympanic membrane displacement (spTMD) and A mean intracranial pressure (ICP), B spectral amplitude of intracranial pressure (Amp_ICP), C arterial blood pressure (ABP), and D spectral amplitude of ABP (Amp_ABP). The regression line (solid line) and 95% of predictor limits (dashed lines) are shown in Figures A–B; r_s — nonparametric Spearman correlation coefficient