Percentage is higher than U.S. percentage of the same sex at the .05 level of statistical significance.

Percentage is lower than U.S. percentage of the same sex at the .05 level of statistical significance.

*p < .05. Difference in average scores is significant at the .05 level of statistical significance.

¹ The advanced mathematics coverage index is the percentage of the corresponding age cohort covered by students in their final year of secondary school who have taken or are taking advanced mathematics courses. The corresponding age cohort is determined for education systems individually. In the United States, the corresponding age cohort is considered 18-year-olds. For additional details, see the Technical Notes available at http://nces.ed.gov/timss/timss15technotes.asp.

² The difference in percentage is calculated by subtracting the females' estimate from the males' estimate using unrounded numbers.

³ Did not satisfy guidelines for sample participation rates.

⁴ Intensive courses are advanced mathematics courses that involve 6 or more hours per week. Results for students in these courses are reported separately from the results for other students from the Russian Federation taking courses that involve 4.5 hours per week.

⁵ Met guidelines for sample participation rates only after replacement schools were included.

NOTE: Education systems are ordered by the percentage of the covered population that is female. Standard error is abbreviated as s.e.

SOURCE: International Association for the Evaluation of Educational Achievement (IEA), Trends in International Mathematics and Science Study (TIMSS) Advanced, 2015.