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[–]yousaythosethingsFind and Replace "gatekeeping" with "having boundaries"[S] 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (6 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 -  (5 children)

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%.

[–]Three_oneFourWanted for thought crimes in countless ideologies 9 insightful - 1 fun9 insightful - 0 fun10 insightful - 1 fun -  (3 children)

I interpreted it as "for 33% of all transgender individuals who have an identical twin, the sibling is also transgender"

This figure is important because it is significantly higher than the rate of non-identical-twin-siblings also being transgender, as any given transgender individual with a different sibling, there is only a 2.6% chance that the sibling is also transgender

[–]IridescentAnacondastrictly dickly 9 insightful - 1 fun9 insightful - 0 fun10 insightful - 1 fun -  (2 children)

Twin studies are difficult, though, because it's hard to separate environmental from genetic effect.

[–]Three_oneFourWanted for thought crimes in countless ideologies 6 insightful - 1 fun6 insightful - 0 fun7 insightful - 1 fun -  (0 children)

True. I'm good friends with a pair of identical twins and cousins with another. Other than resenting each other in teenage years, both pairs are extremely close and share very similar interests. This could potentially be because of genetic factors or because of a very close bond caused by their identical twin status that leads to the incredibly similar environment, closer than most siblings, that leads to such similarities.

The only way to truly isolate whether these are result of identical DNA or identical environments would be an incredibly inhumane method involving separating twins at birth and giving them radically different environments to grow up in to determine how the different twin-trends hold up when that variable is isolated. It is unfortunate that identical twins give us the potential to almost explore different timelines for one person by taking the same starting point down different paths, but only through incredibly tedious, inhumane, and life determining methods.

It's almost like nature is taunting us

[–][deleted] 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

They tried, though. There was that doc, Three Identical Strangers about it.

[–]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.