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[–]yousaythosethingsFind and Replace "gatekeeping" with "having boundaries"[S] 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (2 children)

One study published in the International Journal of Transgender Health found that 33% of identical twin pairs were both trans, compared to only 2.6% of non-identical twins who were raised in the same family at the same time, but were not genetically identical.

Diamond M (2013). "Transsexuality Among Twins: Identity Concordance, Transition, Rearing, and Orientation". International Journal of Transgender Health. 14 (1): 24–38. doi:10.1080/15532739.2013.750222. S2CID 144330783. Combining data from the present survey with those from past-published reports, 20% of all male and female monozygotic twin pairs were found concordant for transsexual identity... The responses of our twins relative to their rearing, along with our findings regarding some of their experiences during childhood and adolescence show their identity was much more influenced by their genetics than their rearing.

[–]Q-Continuum-kin 10 insightful - 1 fun10 insightful - 0 fun11 insightful - 1 fun -  (1 child)

Sounds like assuming causation from an observed correlation.

Also, that number has to be worded poorly. It seems insane that 33% of all identical twins are trans.

Do they mean that when 1 is trans then 33% of that group the other is also trans? The rate of people being trans is something like 0.3%.

[–]yousaythosethingsFind and Replace "gatekeeping" with "having boundaries"[S] 4 insightful - 1 fun4 insightful - 0 fun5 insightful - 1 fun -  (0 children)

I assumed they meant that among identical twins where at least one of the twins is trans, 33% of the time the other twin is too. But based on the year of the study 2013 I don’t know who they are considering trans or what their definition is.