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. 2018 Jan 16;8:852. doi: 10.1038/s41598-017-14943-3

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© The Author(s) 2018

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Vaginal metabolites that differ between smokers and non-smokers. Boxplots display metabolites identified as significantly (q-value = <0.05) different in the vagina of smokers and non-smokers when unadjusted and adjusted for the impact of bacterial community state type (CST). Samples categorized as CST-I (L. crispatus-dominated) and CST-III (L. iners-dominated) were grouped and compared with CST-IV (low-Lactobacillus spp.). Quantile regression was conducted on centered and scaled metabolite concentrations. Significance testing was conducted with Wilcoxon rank sum test and corrected for multiple comparisons.