This is interesting to learn, though I believe this line is relevant:<p><i>Notably, 93% of the self-harm events occurred in patients diagnosed as having a mental health disorder during the 5 years preceding the surgery.</i><p>It would appear there&#x27;s some positive association between incidence of mental health conditions and obesity, which could account for at least some of this difference from the general population. Ultimately, in absolute terms, the increase in self-harm is by 1.3 out of 1000 patients, which is statistically significant, but not so much at an individual level. Considering the much more significant, known health problems associated with obesity, I don&#x27;t believe this finding changes the expected value of bariatric surgery by much.