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. 2021 Jan 20;11:1851. doi: 10.1038/s41598-020-80545-1

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© The Author(s) 2021

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 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/.

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Error bars (mean, 95% confidence interval) showing the occurrence of yawn contagion (Y axis) as a function of individual factors (X axis): sex of the trigger (a) and age of the responder (b). Both variables have a significant main effect on yawn contagion (results of Model₂ included in Table 2) with (a) yawn contagion being highest when the trigger was a male and (b) linearly increasing with age (bivariate correlation via randomization: n = 13, r = 0.600, p = 0.031). CI confidence interval.