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. 2021 Sep 8;44(2):e91–e98. doi: 10.1055/a-1586-6487

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The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commecial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License, which permits unrestricted reproduction and distribution, for non-commercial purposes only; and use and reproduction, but not distribution, of adapted material for non-commercial purposes only, provided the original work is properly cited.

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Fig. 4 — Bland-Altman plot comparison between LPP and nICP in 38 data pairs. MD ± SD of nICP-LPP is 0.45 ± 4.93 cmH2O with CI95 being (–1.2, 2.1). The difference LPP-nICP slightly increases with increasing pressure (nICP + LPP)/2. The plot trend line intersects the line of equal LPP and nICP (nICP-LPP = 0) at a pressure close to 20 cmH ₂ O. The limits of agreement are (–8.1050, 9.0019) for P = 0.90 and (–9.8242, 10.7211) for P = 0.95. The blue line indicates the mean difference of nICP-LPP, and the dotted blue and green lines show the LA for P = 0.90 and 0.95. MD, SD: mean difference, standard deviation. CI95: P = 0.95 confidence interval of MD. LA: limits of agreement