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. 2021 Jan 14;21:42. doi: 10.1186/s12888-021-03038-z

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 1 — Results of the mediation analysis exploring the relationship between severity of OC symptoms (Y-BOCS) and sleep function (lnPSQI) in subjects with OCD. Log transformed (ln) of sleep function was used in the mediation analysis. (a) Unadjusted model. The mediated effect (b) was adjusted for age, sex and benzodiazepines doses. Abbreviations: OC= Obsessive Compulsive; Y-BOCS= Yale-Brown Obsessive Compulsive Scale; PSQI= Pittsburgh Sleep Quality Index; HDRS= Hamilton Depression Rating Scale; STAI-T= State-Trait Anxiety Inventory; lnPSQI=Log-transformed (ln) Pittsburgh Sleep Quality Index; β= unstandardized regression coefficient; SE = standard error