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. 2017 Jun 5;7:2804. doi: 10.1038/s41598-017-03134-9

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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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Trends of key indicators in the Korea national colorectal cancer screening program from 2006 to 2013. (a) Changes in uptake rates (%) of the fecal occult blood test by gender. Uptake rate (%) was calculated as follows; Number of fecal occult blood test participants/Number of eligible individuals for national colorectal cancer screening program. (b) Changes in fecal occult blood test positivity rates (%) by gender and age group. *Comparison of fecal occult blood test positivity rates between males and females and between age groups was performed each year using the Chi-square test. All P-values are <0.001. Fecal occult blood test positivity rate (%) was calculated as follows; Number of positive fecal occult blood test results/Number of fecal occult blood tests performed. (c) Changes in subsequent test compliance rates by gender. Subsequent test compliance rate (%) was calculated as follows; Number of colonoscopy or double-contrast barium enema test procedures performed/Number of positive fecal occult blood test results.