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. 2017 Nov 27;7:16376. doi: 10.1038/s41598-017-16233-4

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© The Author(s) 2017

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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Frequency that features are included at a significant level (P < 0.05) in classifiers with AUC greater than 0.7. (A) Results from 180-day mortality classifiers that used only intraoperative features and (B) that used both pre- and intraoperative features. (C) Results from ARF classifiers that used only intraoperative features and (D) that used both pre- and intraoperative features. Dark shading indicates the fraction of classifiers in which the feature was included with odds ratio (OR) greater than 1 and light shading indicates OR less than 1. The monotone nature of each bar’s shading indicates that features always had ORs on the same side of 1, i.e., they were always associated with risk in the same direction. Features below the dashed line were never included at a significant level.