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. 2018 Feb 23;18:220. doi: 10.1186/s12885-018-4124-0

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© The Author(s). 2018

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 — Adjusted dose-response association between BMI and risk of lung cancer: (a) All participants (b) Men (c) Women (d) Former smokers (e) Current smokers (f) Never smokers. BMI was coded using an RCS function with four knots arbitrarily located at the 5th, 10th, 20th and 40th percentiles. The y-axis represents the adjusted odds ratio for lung cancer risk for any value of BMI compared to individuals with a BMI of 22.0 kg/m² (median value of BMI). Dashed lines are 95% CI. Knots are represented by dots