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Figure T2a. Cut scores of U.S. 15-year-old students on PISA science literacy scale at selected percentiles: 2006, 2009, and 2012

* p<.05. Significantly different from the 2012 score at the .05 level of statistical significance.
NOTE: This table shows the threshold (or cut) score for the following: (a) 10th percentile- the bottom 10 percent of students; (b) 25th percentile- the bottom 25 percent of students; (c) 50th percentile- the median (half the students scored below the cut score and half scored above it); (d) 75th percentile- the top 25 percent of students; (e) 90th percentile- the top 10 percent of students. The percentile ranges are specific to each education system's distribution of scores and to each assessment administration, enabling users to compare scores at the cut scores across education systems and over time. The 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, 2009, and 2012. Scores are reported on a scale from 0 to 1,000.
SOURCE: Organization for Economic Cooperation and Development (OECD), Program for International Student Assessment (PISA), 2006, 2009, 2012.

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Table T2b. Cut scores of U.S. 15-year-old students on PISA science literacy scale at selected percentiles: 2006, 2009, and 2012
Selected percentiles	2006				2009				2012
	Cut score		s.e.		Cut score		s.e.		Cut score		s.e.
90th percentile	628		4.3		629		5.1		619		4.5
75th percentile	567		4.6		572		4.7		563		4.2
50th percentile	488		4.7		502		4.6		498		4.3
25th percentile	412	*	5.4		433		3.9		431		4.4
10th percentile	349	*	5.9		374		4.5		377		4.9
* p<.05. Significantly different from the 2012 score at the05 level of statistical significance. NOTE: This table shows the threshold (or cut) score for the following: (a) 10th percentile- the bottom 10 percent of students; (b) 25th percentile- the bottom 25 percent of students; (c) 50th percentile- the median (half the students scored below the cut score and half scored above it); (d) 75th percentile- the top 25 percent of students; (e) 90th percentile- the top 10 percent of students. The percentile ranges are specific to each education system's distribution of scores and to each assessment administration, enabling users to compare scores at the cut scores across education systems and over time. The 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, 2009, and 2012. Scores are reported on a scale from 0 to 1,000. Standard error is noted by s.e. SOURCE: Organization for Economic Cooperation and Development (OECD), Program for International Student Assessment (PISA), 2006, 2009, 2012.