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A UK study in 2019 said:
Results and Conclusions
Of the 3398 patients who had appointments during this period, 16 (0.47%) expressed transition-related regret or detransitioned...Study findings are consistent with previous research showing low rates of detransition. Detransition was most often prompted by social difficulties rather than changes in gender identity or physical complications and was most
often temporary. Only three patients made a long-term detransition.
A Swedish study from 2014 said:
The regret rate...among those who were sex reassigned was 2.2 % for the whole period 1960–2010 with no significant sex difference. The risk of regretting the procedure was higher if one had been granted a new legal gender before 1990 (11/15). For the two last decades, the regret rate was 2.4 % (1991–2000) and0.3 % (2001–2010), respectively.
From 2015 in the US:
Eight percent (8%) of respondents reported having de-transitioned at
some point. Most of those who de-transitioned did so only temporarily: 62% of those who had de-transitioned reported that they were currently
living full time in a gender different than the gender they were thought to be at birth...Respondents who had de-transitioned cited a range of reasons, though only 5% of those who had de-transitioned reported that they had done so because they realized that gender transition was not for them, representing 0.4% of the overall sample The most common reason cited for de-transitioning was pressure from a parent (36%). Twenty-six percent (26%) reported that
they de-transitioned due to pressure from other family members, and 18% reported that they detransitioned because of pressure from their spouse or partner. Other common reasons included facing too much harassment or discrimination after they began transitioning (31%), and having trouble
getting a job (29%)
From a review of 57 studies by Cornell University in 2017:
Regrets following gender transition are extremely rare and have become even rarer as both surgical techniques and social support have improved. Poling data from numerous studies demonstrates a regret rate ranging from .3 percent to 3.8 percent. Regrets are most likely to result from a lack of social support after transition or poor surgical outcomes using older techniques.
Which papers are these?