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. 2018 Jun 28;18:810. doi: 10.1186/s12889-018-5673-5

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© The Author(s). 2018

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 — Distribution of cohort identification criteria. Pie charts represent the total number and percent (within parentheses) of patients who met the ICD-9 code parameters, opioid parameters, or ICD-9 code plus opioid parameters, as described in the Methods section. Parameters are reported for years 2006 (a), 2007 (b), 2009 (c), and 2010 (d)