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. 2020 May 18;20:115. doi: 10.1186/s12871-020-01036-4

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© The Author(s) 2020

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. 1 — Sample average treatment effect (SATE) measured as relative risk of any postoperative nausea/vomiting modeling entire sample as non-users, current (non-daily), or daily cannabis users. Estimates stratified by Apfel score. 95% Bayesian posterior credible interval for SATE generated from 1000 MCMC estimates. Pooled estimate across all Apfel scores showed at right of each grouping