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In addition to the following questions about TIMSS, more FAQs about international assessments are available at: http://nces.ed.gov/surveys/international/faqs.asp.

How many U.S. schools and students participated in previous TIMSS cycles?

At grade 4


Assessment year
Number of participating schools Number of participating students Overall weighted response rate (percent)
1995 182 7,296 80
2003 248 9,829 78
2007 257 7,896 84
2011 369 12,569 80

At grade 8


Assessment year
Number of participating schools Number of participating students Overall weighted response rate (percent)
1995 183 7,087 78
1999 221 9,072 85
2003 232 8,912 73
2007 239 7,377 77
2011 501 10,477 81

At grade 12


Assessment year
Number of participating schools Number of participating students Overall weighted response rate (percent)
1995      
    Advanced mathematics 199 2,349 67
   Physics 203 2,678 68

NOTE: The overall weighted response rate is the product of the school participation rate, after replacement, and the student participation rate, after replacement. There was no grade 4 assessment in 1999.

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