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. 2019 Jun 11;19:98. doi: 10.1186/s12871-019-0774-y

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Predictive ability of NIPE for a traditional hemodynamic change at tracheal intubation and skin incision. The area under receiver operating characteristic curve (AUC) values for this predictive ability of NIPE were 0.65 (95%CI 0.50–0.78) at endotracheal intubation and 0.58 (0.44–0.71) at skin incision