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. 2019 Aug 19;9:11982. doi: 10.1038/s41598-019-47322-1

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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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(a) Comparison of K6 score distributions between the 30 s, 40 s, 50 s, 60 s, and 70 s groups. K6 score distributions were commonly right-skewed and similar among all age groups. (b) On a log-normal scale, the distributions for all year groups exhibited a linear pattern with similar gradients, indicating that K6 total scores for all age groups followed an exponential pattern with similar rate parameters. Compared to the graph including all age participants (Figs 3b and 4b, the curves appeared to fluctuate more randomly as the scores increased, likely reflecting the small sample sizes for higher scores. Auxiliary lines indicate the cut-points for moderate and severe psychological distress (a score of 5 and 13, respectively).