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 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 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.
