Nothing!
I think it might be a program that offers scholarships to those who are more likely to actually matriculate there. I have no ties to Minnesota, and perhaps they are reserving them for people who showed more interest in the program and area directly. I visited Pitt in the fall while in the area for work, and they basically told me that they try to only give their 50% scholarship to those who have shown great interest in the program.
I know they are also very community-oriented (the epi dept is in the same dept as community health), and while I wrote about my interest in health disparities in my personal statement, it was heavily oriented towards research/learning hard epi/biostats skills.
Fingers crossed for offers at other places.
Not on the topic of scholarships--are you intending to pursue steps/residency here in the US? I am friends with a lot of IMGs and it can be a tough path!