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Kathleen Maclay, Press Release: Researcher's study sheds new light on math
ability, gender equity. UC Berkeley, Jan. 11, 2010.
http://www.berkeley.edu/news/media/releases/2010/01/11_gender_math_study.shtml
which cites Else-Quest NM, Hyde JS and Linn MC, Cross-National Patterns of
Gender Differences in Mathematics: A Meta-Analysis. Psychological Bulletin,
136: 103 (2010).
http://www.apa.org/pubs/journals/releases/bul-136-1-103.pdf
The research uses Trends in International Mathematics and Science Study (
TIMSS) and the Programme for International Student Assessment (PISA), both
of 2003. That explains why Taiwan (called Chinese Taipei) but not China is
used in the study.