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. 2018 Mar 20;16:44. doi: 10.1186/s12916-018-1025-7

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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. 2 — The relation of sleep apnea (a) and reported usual sleep duration (b) to motor vehicle crash risk, adjusted for age, sex, and miles driven. Data are shown separately for non-sleepy (black, n = 2402) and sleepy (gray, n = 799) participants, where sleepiness is defined as a score ≥ 11 on the Epworth Sleepiness Scale. The referent group for a is non-sleepy participants with apnea-hypopnea index < 5. The referent group for b is non-sleepy participants reporting a usual sleep duration of 8 hours per night