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. 2018 Aug 24;18:123. doi: 10.1186/s12883-018-1113-5

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© The Author(s). 2018

Open Access This 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 — Direction and strength of correlations between questionnaire results for primary and secondary outcome variables at the beginning of the study. PSQI Pittsburgh Sleep Quality Index, MFIS Modified Fatigue Impact Scale, SF-36 Short Form 36, PCS physical component score, MCS mental component score, ESS Epworth Sleepiness Scale, HADS-D Hospital Anxiety and Depression Scale Depression Subscale, HADS-A Hospital Anxiety and Depression Scale Anxiety Subscale