Jothar, which students did this study survey? Did the students attend local colleges as commuters, or did they attend colleges far from home? If the latter, did they live on campus or in frum communities off-campus?
I knew about a dozen other frum people who attended my commuter college. They all remained at the same level of religious observance, though one pharmacy student who’d attended a co-ed high school now supports a husband in kollel.