@theilltemperedamateur Suppose all the morbidity exhibited by the GR+ group occurred before, during, and just after the actual treatment period, after which the subjects enjoyed psychiatric plain sailing for many decades?
From the report (my bold):
Psychiatric treatment, excluding gender identity assessments and appointments with a multi-disciplinary team therein, subsequent to the index contact was defined as continuing two years or more after the index contact, to allow time for the gender identity assessment and potential medical GR initiation.
So the researchers, who presumably understand how the system in Finland works, seem confident that any medical GR would have been initiated by 2 years post-index contact.
'Just after' actual treatment period would apply to surgery, but not to hormonal intervention, which would be ongoing.
I'm not disagreeing with your overall point, just drilling down into the details