The relationship between connectedness to the university, Appalachian regional origin, and self-reported GPA was investigated in two studies. Both studies found that the association between school connectedness and GPA was positive among Appalachian students. However, counter to previous research, there was no association among the non-Appalachian students.
Steffen Wilson and Jonathan Gore. "Appalachian Origin Moderates the Association between School Connectedness and GPA" Journal of Appalachian Studies 15.1 & 2 (2009): 70-86.