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. 2019 Jun 24;19:174. doi: 10.1186/s12877-019-1182-3

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© The Author(s). 2019

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 — Discriminative ability, cutoffs and accuracy indices of the Severity of Dependence Scale for central nervous system depressants. ROC curve analysis yielded an AUC of 0.86. A score of 5.5 was determined as the optimal cutoff as it generated the best accuracy indices, highest chi-square test value, maximum Youden’s index and minimum Euclidean distance