There was a blog written about a mental health study done on college students. It found that many have mental health issues and of those that do, about 64% end up dropping out of college, sadly. It discusses how mental health should be treated and properly addressed to avoid these unfortunate circumstances. The first way was to train staff and faculty to deal with students under these conditions.
The actual study write-up gave a lot of interesting insights and statistical information on mental health and who it affects most and with what type those groups are affected, typically.
From what I read, the study raised no ethical concerns, but it did, however, present some bias, as people had to be willing to participate with these conditions, which are often sensitive and hard to address, so the participants had to be relatively open about the subject to get good, reliable, and valid data.