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. 2019 Feb 18;9:2188. doi: 10.1038/s41598-019-38715-3

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© The Author(s) 2019

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 survival analysis comparing peptic ulcer recurrence in patients with different levels of sleep quality and change of social engagement. Cumulative incidence curves show the differences of time and peptic ulcer recurrence events in patients with (1) good sleep quality, (2) poor sleep quality and increased social engagement, (3) poor sleep quality and continued social engagement, (4) poor sleep quality and decreased social engagement, and (5) poor sleep quality and no social engagement. P-value presents the statistical difference between the five groups in log-rank test.