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. 2016 Nov 24;16:159. doi: 10.1186/s12890-016-0323-0

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© The Author(s). 2016

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 — Hypoxic ventilatory response in non-smokers and smokers. Individual (small symbols) and mean ± S.E.M. (big symbols) values of the isocapnic hypoxic ventilatory response (HVR) of non-smokers and 12-h-abstinent smokers. HVR values represent ventilatory increases (l min⁻¹) per 1% decrease in O₂-saturation and are individually normalized for, i.e. divided by, body mass index (BMI). The difference between smokers and non-smokers was highly significant (Student’s t-test, unpaired)