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. 2016 Jun 2;16:64. doi: 10.1186/s12903-016-0216-x

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 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.

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Fig. 2 — Diagnostic chart for periodontal screening by salivary Hb and LD levels. The cutoff points for Hb and LD were 1.25 μg/mL and 298 IU/L, respectively. When samples were positive for both Hb and LD, the positive predictive value was 91.7 %. When both Hb and LD were negative, the negative predictive value was 75.0 %