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The number of young people with gender dysphoria and trans identification has risen sharply in the last two decades, and the reasons for this are unknown (e.g., Aitken et al., 2015 ; Kaltiala et al., 2020 ; Zhang et al., 2021 ). Those with adolescent onset comprise the majority of the surge in new cases, dominated by natal females, in contrast to the much rarer earlier cases, which were dominated (~ 2:1) by prepubertal natal males. Many in this new cohort have comorbidities (Kaltiala-Heino et al., 2018 ); earlier cases often did as well, including anxiety (Wallien et al., 2007 ) and specifically separation anxiety (Zucker et al., 1996 ).
Jonathan Cohn (Mon,) studied this question.