According to the article A landmark Finnish study is changing how we approach transgender kids:
A major new study out of Finland found that providing cross-sex hormones and gender-transition surgeries to adolescents and young adults didn’t appear to have any significant effect on suicide deaths.
They are referring to the study All-cause and suicide mortalities among adolescents and young adults who contacted specialised gender identity services in Finland in 1996–2019.
Is it true that gender transitioning has no effect on suicidal ideation?