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. 2019 Jul 18;9:10434. doi: 10.1038/s41598-019-46898-y

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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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The regression tree modelling the hierarchical relationship between weekly H7N9 cases number with Baidu Searching Index (BSI) and Weibo Posting Index (WPI) in China from 2013 to 2017. Note: The numbers in boxes shown the average of weekly H7N9 cases number and N that is the total week count of occurrence of H7N9 cases, the numbers out of boxes shown threshold values generated by regression tree.