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. 2018 Sep 12;8:13653. doi: 10.1038/s41598-018-31704-y

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© The Author(s) 2018

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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Mean Elithorn Mazes test scores (with 95% confidence intervals) for males and females from same-sex and opposite-sex twin pairs. Note. Mm = Males with a male co-twin; Mf = Males with a female co-twin; Fm = Females with a male co-twin; Ff = Females with a female co-twin. All the tests were standardized for the whole sample (males and females combined) with a mean of 0. Analyses were then run on these standardized values for males and females separately. For all measures, males’ average scores were positive and females’ average scores were negative.