On average, 1 in how many people are transgender?

Conron, K.J, et. al (2011), USA (Mass.) gathered data via phone surveys. They found a prevalence rate of 1:200 MTF. (n=28,000)

Horton, M.A. (2008), USA gathered data in 2001. Surveying SRS surgeons on how many surgeries they did each year. She found a prevalence rate of 1:750 MTF.

Conway, L. (2001), USA gathered data in 2001. Reviewing the number of surgeries performing SRS. She found a prevalence rate of 1:1500 MTF (between 1:250 - 1:2500).

Veale, J. (2008), New Zealand gathered data in 2008 by reviewing people who changed gender markers on New Zealand passport.She found a prevalence rate of 1:3,639 MTF. (n=385)

Wilson, Sharp, & Carr (1999), Scotland gathered data in 1998. Their data was based on counting the number of people with DX of Gender Dysphoria. They found a prevalence rate of 1:7,400 MTF

Bakker, van Kesteren, Gooren, & Bezemer (1993), Netherlands gathered data from 1986-1990. Their data was based on the number who received hormone therapy. They found a prevalence rate of 1:11,900 MTF

Wilson, Sharp, & Carr (1999), Scotland gathered data in 1998. They used another measurement: counting number who received hormone therapy and/or SRS . This time, they found a prevalence rate of 1:12,800 MTF

... and it goes up from there.

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