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. 2020 Oct 15;10:17432. doi: 10.1038/s41598-020-74082-0

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© The Author(s) 2020

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Kaplan–Meier analysis of overall survival of lung cancer patients. The study cohort was divided into strata based on residency in Xuanwei-Fuyuan (XF) and whether the lung cancer was diagnosed by screening (see color key). For patients diagnosed not by screening, XF residents (blue) had better prognosis than the residents of the rest of Yunnan Province (red) (top panel; P < 0.001, log rank test). The dashed lines above and below the survival curves mark the 95% confidence intervals. The number of patients at risk were tabulated (middle panel), and the number of patients censored were plotted against time (bottom panel).