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To substantiate evidence that the brain structure of TIs differs from male and female, we use a combined multivariate and univariate approach. Gray matter segments resulting from voxel-based morphometry preprocessing of <jats:italic>N<\/jats:italic>\u2009=\u20091753 cisgender (CG) healthy participants were used to train (<jats:italic>N<\/jats:italic>\u2009=\u20091402) and validate (20% holdout <jats:italic>N<\/jats:italic>\u2009=\u2009351) a support-vector machine classifying the biological sex. As a second validation, we classified <jats:italic>N<\/jats:italic>\u2009=\u20091104 patients with depression. A third validation was performed using the matched CG sample of the transgender women (TW) application sample. Subsequently, the classifier was applied to <jats:italic>N<\/jats:italic>\u2009=\u200926 TW. Finally, we compared brain volumes of CG-men, women, and TW-pre\/post treatment cross-sex hormone treatment (CHT) in a univariate analysis controlling for sexual orientation, age, and total brain volume. The application of our biological sex classifier to the transgender sample resulted in a significantly lower true positive rate (TPR-male\u2009=\u200956.0%). The TPR did not differ between CG-individuals with (TPR-male\u2009=\u200986.9%) and without depression (TPR-male\u2009=\u200988.5%). The univariate analysis of the transgender application-sample revealed that TW-pre\/post treatment show brain-structural differences from CG-women and CG-men in the putamen and insula, as well as the whole-brain analysis. Our results support the hypothesis that brain structure in TW differs from brain structure of their biological sex (male) as well as their perceived gender (female). This finding substantiates evidence that TIs show specific brain-structural alterations leading to a different pattern of brain structure than CG-individuals.<\/jats:p>","DOI":"10.1038\/s41386-020-0666-3","type":"journal-article","created":{"date-parts":[[2020,4,9]],"date-time":"2020-04-09T02:02:46Z","timestamp":1586397766000},"page":"1758-1765","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":22,"title":["Biological sex classification with structural MRI data shows increased misclassification in transgender women"],"prefix":"10.1038","volume":"45","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5164-8227","authenticated-orcid":false,"given":"Claas","family":"Flint","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Katharina","family":"F\u00f6rster","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sophie A.","family":"Koser","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carsten","family":"Konrad","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pienie","family":"Zwitserlood","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Klaus","family":"Berger","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marco","family":"Hermesdorf","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tilo","family":"Kircher","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Igor","family":"Nenadic","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Axel","family":"Krug","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bernhard T.","family":"Baune","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Katharina","family":"Dohm","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ronny","family":"Redlich","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nils","family":"Opel","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Volker","family":"Arolt","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tim","family":"Hahn","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaoyi","family":"Jiang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Udo","family":"Dannlowski","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dominik","family":"Grotegerd","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2020,4,9]]},"reference":[{"key":"666_CR1","doi-asserted-by":"publisher","first-page":"68","DOI":"10.1038\/378068a0","volume":"378","author":"JN Zhou","year":"1995","unstructured":"Zhou JN, Hofman MA, Gooren LJG, Swaab DF. 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