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. 2016 Sep 13;16(1):239. doi: 10.1186/s12909-016-0751-9

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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. 2 — Relative Time Curves of the percent of time spent less than a performance (left panels) or alertness (right panels) value for each of the five group schedules for day work (top panels) and night work (bottom panels) hours. Note that for the night-time schedules, the Q3 and Q4 values overlap and values for only one of those schedules is easily visible