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. 2018 Jun 11;30:41. doi: 10.1186/s40557-018-0252-x

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© The Author(s). 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 6 — Dose-response relationship between PM10 concentration and Visit Index of patients with keratitis from January, 2006 to December, 2014. Visit Index – number of patients with conjunctivitis or keratitis / number of all patients × 1000. *: Pearson’s correlation coefficient; **: statistical analysis by Pearson’s correlation analysis