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. 2019 May 31;21:132. doi: 10.1186/s13075-019-1918-7

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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. 1 — Covariates associated with allopurinol use in participants with gout. Legend: a Predicted, population-averaged marginal probabilities for each category of allopurinol use (classified as never, prior, current) use by covariates (stacked bar charts) and b risk difference effect sizes (outcome Helmert contrasts) for covariate associations with allopurinol use, with vertical bars representing 95% confidence intervals. Analysis was performed by multinomial logistic regression