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. 2020 Jan 23;20:52. doi: 10.1186/s12884-020-2748-y

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© The Author(s). 2020

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 — Trend of the prevalence of smoking during pregnancy, by educational attainment, 2010–2017. Cochran–Armitage tests were used to assess the statistical significance of changes in the trend of the prevalence of smoking during pregnancy stratified by educational attainment (p < 0.001 for all education subgroups). Logistic regression results show the odds of smoking during pregnancy and whether the trend differed significantly between educational attainment groups (p < 0.0001)