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. 2018 Apr 25;8:6511. doi: 10.1038/s41598-018-24836-8

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© The Author(s) 2018

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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Boxplots of (a) near infrared spectroscopy (NIRS) cerebral regional haemoglobin oxygen saturation (CrSO₂), (b) peripheral perfusion index (PI), (c) heart rate (HR) and (d) capillary oxygen saturation (SpO₂) in PH-IVH patients (left boxplots) and healthy age-matched controls (right boxplots). On each box, the central mark is the median, the square is the mean, the stars are the individual data, the edges of the box are the 25^th and 75^th percentiles, and the whiskers show the 95% confidence interval. Empty circles denote outliers and statistical comparisons are indicated with corresponding p-values (n.s., non-significant).