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. 2021 Apr 12;21:191. doi: 10.1186/s12903-021-01477-4

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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/. 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 in a credit line to the data.

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Fig. 6 — Increased score on oral health questionnaire in participants with low saliva flow as measured by PDT and BokaFlo™. Comparison of the summed questionnaire score for all 15 questions grouped by flow categorization based on both PDT and BokaFlo™. For PDT, a significant difference in mean questionnaire score for low flow and mean questionnaire score for normal flow was present (*p < 0.02). According to BokaFlo™ results, a significant difference in mean was present between both low flow versus borderline questionnaire scores (***p < 0.001) and for low flow versus normal questionnaire scores (**p < 0.002)