It looks like an interesting study, though whether it will stand up to scientific scrutiny I just don't know. The interviews were done by interviewers who were not psychiatrists or psychologists. That ALONE makes me think figures may be higher than are actually present.
I also think it is very hard to figure out if those with drug/alcohol problems have them because mental illness other than that, because they ahve the gene that we know is at least part of alcoholism, or if they learned alcoholic behavior patterns from family members. There are SO MANY reasons behind these problems, not to mention the other problems in the survey.
I also think the figure of 25% of those who have a mental disorder get help is VASTLY over-inflated. The university in my town has a substantial student population when you count the undergrads adn grad students. There is also a 2 year college adjunct to the university. This is one of the 2 major state univs in my state. And they have 1 psychiatrist who works 2 days per MONTH at the health center. They have 4 tdocs who work there, and then there is a counselling center with services provided by senior and grad students, overseen by licensed tdocs. I am not sure how many baby tdocs see clients each semester at the teaching center. BUT to have just 2 day a month where a student can see a psychiatrist - IF they can get in, that is (I had to pull MAJOR strings to get in, and it was over a full semester's wait - few, if any students will/can wait that long).
I am not susre that the numbers cited in this study are reliable, but if they bring ANY increased services to college kids, I am all for it.