Studies of hormonal treatment or legal name change find higher prevalence than sex reassignment, with, for example a 2010 Swedish study finding that 1 in 7,750 adult natal males and 1 in 13,120 adult natal females requested a legal name change to a name of the opposite gender.Studies that measure transgender status by self-identification find even higher rates of gender identity different from sex assigned at birth (although some of those who identify as transgender or gender nonconforming may not experience clinically significant distress and so do not have gender dysphoria). A study in New Zealand found that 1 in 3,630 natal males and 1 in 22,714 natal females have changed their legal gender markers. A survey of Massachusetts adults found that 0.5% identify as transgender. A national survey in New Zealand of 8,500 randomly selected secondary school students from 91 randomly selected high schools found 1.2% of students responded "yes" to the question "Do you think you are transgender?". Outside of a clinical setting, the stability of transgender or non-binary identities is unknown.Research indicates people who transition in adulthood are up to three times more likely to be male assigned at birth, but that among people transitioning in childhood the sex ratio is close to 1:1. The prevalence of gender dysphoria in children is unknown due to the absence of formal prevalence studies. History
Neither the DSM-I (1952) nor the DSM-II (1968) contained a diagnosis analogous to gender dysphoria.
In Thrace, a tradition of three original Muses persisted.In the first century BC, Diodorus Siculus cited Homer and Hesiod to the contrary, observing:

 Writers similarly disagree also concerning the number of the Muses; for some say that there are three, and others that there are nine, but the number nine has prevailed since it rests upon the authority of the most distinguished men, such as Homer and Hesiod and others like them. Diodorus states (Book I.18) that Osiris first recruited the nine Muses, along with the satyrs, while passing through Aethiopia, before embarking on a tour of all Asia and Europe, teaching the arts of cultivation wherever he went. According to Hesiods account (c. 600 BC), generally followed by the writers of antiquity, the Nine Muses were the nine daughters of Zeus and Mnemosyne (i.e., "Memory" personified), figuring as personifications of knowledge and the arts, especially poetry, literature, dance and music. The Roman scholar Varro (116–27 BC) relates that there are only three Muses: one born from the movement of water, another who makes sound by striking the air, and a third who is embodied only in the human voice. They were called Melete or "Practice", Mneme or "Memory" and Aoide or "Song". The Quaestiones Convivales of Plutarch (46–120 AD) also report three ancient Muses (9.I4.2–4).However, the classical understanding of the Muses tripled their triad and established a set of nine goddesses, who embody the arts and inspire creation with their graces through remembered and improvised song and mime, writing, traditional music, and dance.