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. 2019 Mar 20;18:22. doi: 10.1186/s12940-019-0463-9

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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. 3 — Unadjusted associations of ln-transformed maternal urinary cotinine levels and Bayley scores in infants at 24 months of age. a Mental Development Index (MDI) and (b) Psychomotor Development index (PDI). The Generalized Additive Model was used. Dashed vertical straight line at 0.64 in each figure represents the median level of urinary cotinine, exp. (0.64) = 1.90