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. 2021 Apr 19;12(2):129–140. doi: 10.1007/s13167-021-00240-7

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© The Author(s) 2021

Open AccessThis 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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Fig. 4 — Regularity of professional oral care in stratified patient groups: Particular difference was observed considering the frequency of professional oral care used by youngest and oldest groups: either “never” or “once a year” was most characteristic for the oldest group compared to all other groups, whereas “more than once a year” was the most characteristic for the youngest group; significance of a difference between groups A and B is P_AB > 0.05; significance of a difference between groups A and C is P_AC > 0.05; significance of a difference between groups A and D is P_AD < 0.01; significance of a difference between groups A and D is P_BC > 0.05; significance of a difference between groups B and D is P_BD > 0.05; significance of a difference between groups C and D is P_CD > 0.05