Six years of national percentile rank (NPR) data for students assessed in grades 3, 5, 6, and 7 are presented. The NPR is the average student’s rank or position compared with a representative nationwide group of students (national norm group) in the same grade. The NPRs range from 1 to 99 and have a median of 50. At the school-level, a NPR of 48 means that 48 percent of the students nationally (in the norm group and in the same grade) scored at or below the average score obtained by the students in the school.