CREATE TABLE table_73631 ("Institution" TEXT, "Location" TEXT, "Team Name" TEXT, "Founded" FLOAT, "Affiliation" TEXT, "Enrollment" FLOAT, "Year Joined" FLOAT)

What is the affiliation when the institution was ohio christian university?
SELECT "Affiliation" FROM table_73631 WHERE "Institution" = 'Ohio Christian University'
SELECT "Affiliation" FROM "table_73631" WHERE "Institution" = 'Ohio Christian University'