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. 2017 Aug 17;7:8581. doi: 10.1038/s41598-017-09233-x

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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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Kaplan-Meier estimates for survival probabilities in the lower two tertiles (red) and the upper tertile (blue), respectively. Median follow up for the lower two tertiles was 428 days while the median follow up time for the upper tertile was 432 days. The number of patients at risk is indicated in the table below the graph. The time to death differs significantly between the two groups (P = 0.0051, log-rank test).