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. 2019 Oct 16;5:15. doi: 10.1038/s41405-019-0017-9

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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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Fig. 3 — Overall plot of total anxiety score versus student age for the combined first- and final-year BDS students (r = −0.244). Although the negative correlation coefficient observed is low, this relationship was very highly statistically significant (p < 10⁻⁴) in view of the very large sample size (n = 614), and demonstrates an age-dependent decrease in the total anxiety score. 95% Confidence intervals for both the mean regression values and individual observations are provided