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. 2021 May 6;50(8):3329–3352. doi: 10.1007/s10508-021-02005-9

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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/.

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Fig. 3 — 3D bubble charts of the mean age and sample size of: a cisgenders and transgenders involved in the selected studies (left) (Note: the graph does not include the study by Yokota et al., 2005 because of the lack of data), and b heterosexuals and homosexuals involved in the selected studies (right) (Note: the graph does not include the study by Hu et al., 2011 because of the lack of data. Four studies (Kagerer et al., 2011; Perry et al., 2013; Sylva, 2013; Zeki & Romaya, 2010) reported just the mean age of all the sample size, and we assumed that it was the same in heterosexual and homosexual subsamples)