In one set of analyses, students within a department were divided into quartiles based on GRE scores and the percentage of students in the top and bottom quartiles earning a 4.0 average was noted. Students in the top quartile were 3 to 5 times as likely to earn 4.0 averages compared to students in the bottom quartile. Even after controlling for undergraduate grade point average quartiles, substantial differences related to GRE quartile remained.