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. 2020 Jan 29;10:1419. doi: 10.1038/s41598-020-58413-9

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© The Author(s) 2020

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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(a) KDE histograms of MSFsc of subjects living with a partner (red) compared with those living without a partner (blue) in the same household; (b) KDE histograms of BAmid of subjects living with a partner (red) compared with those living without a partner (blue) in the same household. Student t test shows that living with a partner is significantly associated with MSFsc and BAmid of the subject. (c) Boxen plot of MSFsc categorized according to presence (yes) or absence (no) of subject’s partner in the same household compared separately for extremely early (left), non-extreme (middle) and extremely late (right) normalized chronotypes. (d) Boxen plots of MSFsc categorized according to presence (yes) or absence (no) of subject’s partner in the same household and compared separately for 18–40 years old (left) and older than 40 years (right). Data show significant association of MSFsc with presence of a partner only in younger adults.