The study itself is not actually about “gender dysphoria” as it has previously been defined in the scientific literature. Rather, it is about the newer phenomenon of “rapid-onset gender dysphoria” (ROGD). Prior to about ten years ago, cases of gender dysphoria typically involved a long history of a child rejecting identification with his or her biological sex, going back before puberty.

By contrast, “rapid-onset gender dysphoria” involves a post-pubescent child, usually a girl, with no history of dysphoria suddenly claiming within a period of weeks or months not to identify with her biological sex. Not only is rapid-onset gender dysphoria sudden, but it tends to occur in clusters.

Robert Tracinski ( The Federalist) on Is Transgender the New Anorexia?

http://thefederalist.com/2018/09/06/transgender-new-anorexia/