Fourth-grade NAEP U.S. history percentile scores
Findings
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Scores were higher in 2006 than in 1994 for lower- and middle-performing students. 
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There were no significant changes in the scores in 2006 for higher-performing students when compared to either 1994 or 2001. 

* Significantly different from 2006.
NOTE: View complete data with standard errors.
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 1994, 2001, and 2006 U.S. History Assessments.