I offered some information about prevalence in a previous post. I am re-posting those studies here with the addition of some new studies, filling in some omissions, adding links where available and adding some new thoughts.
These are studies that observed at least the year 1990 to the present and where prevalence estimates where made. Sorted by the last year of the study (not the publication year).
(Note: N =number of people in the study, MtF = Male to Female, FtM=Female to Male, Prevalence should be read as ‘one in 42,000’)
|Author||Period Reported||Country||Incusion Criteria||N||MtF : FtM||Prevalence|
|Weitze & Osburg (1996)||1981-1990||Germany||Granted legal change of name or gender status||1047||2.3 :1||MtF:1 : 42,000 FtM:1 : 104,000|
|Bakker, van Kesteren, Gooren, & Bezemer (1993)||1986-1990||Netherlands||Receiving hormone therapy||713||2.5 :1||MtF:1 : 11,900 FtM:1 : 30,400|
|Wilson, Sharp, & Carr (1999)||circa 1998||Scotland||Gender Dysphoria||273||4 : 1||MtF:1 : 7,400 FtM:1 : 31,200|
|Wilson, Sharp, & Carr (1999)||circa 1998||Scotland||Receiving Hormone therapy or post-surgery||160||3.8 :1||MtF:1 : 12,800 FtM:1 : 52,100|
|Horton, M.A. (2008)||2001||USA||based on survey of surgeons who performed SRS||2:1||MtF:1 : 750 FtM:1 : 1,400|
|Conway, L. (2001)||2001||USA||based on estimates of the numbers of sex reassignment surgeries||MtF:1 : 1500* the estimate was between 1 in 250 to 1 in 2500|
|De Cuypere et al. (2007)||1985-2003||Belgium||Completed sex reassignment surgery||412||2.4 :1||MtF:1 : 12,900 FtM:1 : 33,800|
|Gomez Gil et al. (2006)||1996-2004||Spain||Diagnosis of Transsexualsism||161||2.6 :1||MtF: 1 : 21,000 FtM: 1: 48,100|
|Reed, et al (GIRES) (2009)||2007 (also see 2011 update here)||United Kingdon||people who sought tx for gender variance||MtF: 1 : 10,000|
|Veale, J. (2008)||2008||New Zealand||people who changed gender markers on New Zealand passport||385||MtF: 1 : 3639 FtM: 1: 22,714|
|Conron, K.J, et. al (2011)||2010||USA – Mass||phone survey of housholds in MA||28000||MtF: 1 : 200 * survey did not distinguish between MtF or FtM|
A few points
- The Male to Female numbers are much more reliable than the Female to male numbers at this point. Many researchers argue that FtM transgender individuals can live more easily with male gender expression and may present for treatment less.
- The incidents of gender variance being reported are more or less increasing over time (see the graph below). Some researchers have noted that reported incidents are higher in cities and in more tolerant cultures.
- Gender Variance is extremelty hard to count due to individuals remaining hidden or choosing not to seek any type of treatment because of stigma.
Some new data – not worked into the chart yet:
- A 2013 survey on transgender high school kids of 1953 students in 21 High Schools in San Francisco found that 0.7% self identified as transgender and another 1.4% chose “not sure”.
In a survey of over 8,000 high school students in New Zealand, 1.2% identified as transgender.
Almost 3 percent of Minnesota teens identify as transgender or gender nonconforming http://www.startribune.com/almost-3-percent-of-minnesota-teens-identify-as-transgender-or-gender-non-conforming/437172583/
Find out about Psychotherapy when dealing with Gender variance in yourself or someone close to you.