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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. 1 — Receiver operator characteristics (ROC) curves for periodontitis based on the Community Periodontal Index (CPI) and salivary hemoglobin (Hb), and lactate dehydrogenase (LD) levels. The area under the ROC curve (AUC) was higher for the CPI than for the saliva tests (CPI, 0.954; Hb, 0.846; LD, 0.737)