On average, Catholic high school graduates were 7 to 11 percent more likely to vote when they reached young adulthood compared with graduates of public high schools, after controlling for school selectivity.

Source: "The Effects of Catholic Schooling on Civic Participation" Dee, Thomas S. International Tax and Public Finance Vol. 12, Number 5. , 2005. Page(s) 605-625.

(HT: FamilyFacts.org