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Table B.1.66. Average scores of U.S. 15-year-old students on science literacy scale, by selected percentiles: 2006 and 2009
Selected percentiles 2006   2009
Score   s.e.   Score   s.e.
95th percentile 662   4.8   662   6.7
90th percentile 628   4.3   629   5.1
75th percentile 567   4.6   572   4.7
50th percentile 488 * 4.7   502   4.6
25th percentile 412 * 5.4   433   3.9
10th percentile 349 * 5.9   374   4.5
5th percentile 318 * 4.5   341   4.8
U.S. average 489 * 4.2   502   3.6
* p < .05. Significantly different from the 2009 score at the .05 level of statistical significance.
NOTE: This table shows the threshold (or cut point) score for the following: (a) 5th percentile – the bottom 5 percent of students; (b) 10th percentile – the bottom 10 percent of students; (c) 25th percentile – the bottom quarter of students; (d) 50th percentile – the median (half the students scored below the cut point and half scored above it); (e) 75th percentile – the top quarter of students; (f) 90th percentile – the top 10 percent of students; and (g) 95th percentile – the top 5 percent of students. The percentile ranges are specific to each country's distribution of scores and to each assessment administration, enabling users to compare scores at the cut points across countries and over time. The Program for International Student Assessment (PISA) science framework was revised in 2006. Because of changes in the framework, it is not possible to compare science learning outcomes from PISA 2000 and 2003 with those from PISA 2006 and 2009. Scores are reported on a scale from 0 to 1,000. Standard error is noted by s.e.
SOURCE: Fleischman, H.L., Hopstock, P. J., Pelczar, M.P, and Shelly, B.E. (2010). Highlights From PISA 2009: Performance of U.S. 15-Year-Old Students in Reading, Mathematics, and Science Literacy in an International Context (NCES 2011-004), supplemental table S3a. U.S. Department of Education, National Center for Education Statistics. Washington, DC: U.S. Government Printing Office.
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National Center for Education Statistics -
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