Prevalence (by Wiki)

There are no reliable statistics on the prevalence of transsexualism. The DSM-IV (1994) quotes prevalence of roughly 1 in 30,000 assigned males and 1 in 100,000 assigned females seek sex reassignment surgery in the USA. The most reliable population based estimate of the incidence occurrence is from the Amsterdam Gender Dysphoria Clinic. The data, spanning more than four decades in which the clinic has treated roughly 95% of Dutch transsexuals, gives figures of 1:10,000 assigned males and 1:30,000 assigned females.

In September 2007, however, Olyslager and Conway presented a paper at the WPATH 20th International Symposium demonstrating that the data from this and similar studies actually implies much higher prevalence rates, with minimum lower bounds of 1:4,500 assigned males and 1:8,000 assigned females across a number of countries worldwide. They also present other evidence suggesting the actual prevalence might be as high as 1:500 births overall.

Other data presented in the paper implies that the U.S. population of assigned males having already undergone reassignment surgery by the top three U.S. SRS surgeons alone is enough to account for the entire transsexual population implied by the 1:10,000 prevalence number. This of course ignores all other U.S. SRS surgeons, the popularity among U.S. transsexuals of obtaining their surgery in other countries such as Thailand where the cost may be less prohibitive, and the high proportion of transsexuals who have not yet had reassignment surgery or have not yet even sought help for their condition, making that figure (1:10,000) clearly untenable.

A presentation at the LGBT Health Summit in Bristol UK, based upon figures from a number of reputable European and UK sources, shows that this population is increasing rapidly (14% per year) and that the the mean age of transition is actually rising.