Analysis of 30 years of SAT and ACT tests administered to the top 5% of U.S. 7th graders has found that the ratio of 7th graders scoring 700 or above on the SAT-math has dropped from about 13 boys to 1 girl to about 4 boys to 1 girl. The ratio dropped dramatically between 1981 and 1995, and has remained relatively stable since then. The top scores on scientific reasoning, a relatively new section of the ACT that was not included in the original study, show a similar ratio of boys to girls.
Gender gap persists at highest levels of math and science testing
Reference
Wai, J., Cacchio, M., Putallaz, M., & Makel, M. C. Sex differences in the right tail of cognitive abilities: A 30 year examination. Intelligence, 38(4), 412-423. Retrieved from http://www.sciencedirect.com/science/article/B6W4M-508JX5V-1/2/a7a94d975c4cc5b256c7389ccd75431b
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