05/28/2026
DYK? NCES reports the long-term trend results as average scores and the percentages of students reaching specific performance levels. Those levels are different from the achievement levels—NAEP Basic, Proficient, Advanced—that we use to report results for the grade-based NAEP assessments.
Here’s a look at what 9- and 13-year-old students are likely able to demonstrate at the different performance levels on the long-term trend assessments. ⬇️