I left Oxford a few years ago after a failed suicide attempt. I had become overwhelmingly obsessed with studying and achieving and, despite going to see tutors about this, was offered no support, was not encouraged to see a counselor. My concerns, it is fair to say, were brushed away as the standard anxieties of a high-achiever. Indeed, I found that there was almost an attitude of approval about the fact that I was so emotionally tied to success. Which I now find fairly sinister.
I am in no way qualified or clued-up enough to offer any useful analysis on the data about suicide frequency in the Oxford population compared to the 'non-Oxford' population. But I do feel that I am qualified to say that the university, at the time I left, was utterly sub-par in its responsibility to provide students with anything approaching sustained support in matters of mental well-being and seemed woefully disinterested in fostering a healthy attitude towards study.
This was in stark contrast to both institutions I attended since for my BA and MSc.
I hope that the institution has improved since I left.