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May 29, 2008 -- The math gender gap is huge in some countries and virtually nonexistent in others, suggesting that social and cultural influences trump biology when it comes to how boys and girls learn arithmetic.
When 15-year-olds from different countries took the same math test, little or no difference was seen in scores between girls and boys living in cultures with few sex-based restrictions on girls.
Test scores for girls lagged the most in countries where gender inequities were most pervasive.
"The so-called gender gap in math skills seems to be at least partially correlated to environmental factors," says economist and study researcher Paola Sapienza, PhD of Northwestern University's Kellogg School of Management. "The gap doesn't exist in countries in which men and women have access to similar resources and opportunities."
(Is your kid good at math? If he or she is struggling, why do you think that is? Talk with other moms and dads on WebMD's Parenting: Preschoolers and Grade Schoolers board.)
The question of whether nature or nurture has the bigger impact on why boys seem to do better in math and girls in reading has been studied for decades.
The fact that there is little difference before the teenage years favors the idea that environment plays a bigger role than biology, Sapienza tells WebMD.
"I think the majority of researchers studying this think that it is a bit of both," she says. "But it is important to understand this. If, for example, 95% of the effect is biological, this means there probably isn't much we can do to change it from a policy standpoint."
The new research, appearing in the May 30 issue of Science, suggests that the opposite is true.
Sapienza and colleagues analyzed the scores of 276,000 teenagers living in 40 countries who took the same standardized tests designed to measure math, reading, science, and problem-solving ability.
When all the scores were combined, boys outscored girls in math by an average of 10 points, and girls outscored boys in reading by almost 33 points.
The researchers assessed cultural views regarding the roles of women and men in each of the countries by reviewing data from established surveys of gender equity.
The surveys asked questions such as "Should women work outside the home?" and "Is it more important for a man to get a college education than a woman?"
In countries with the fewest social and cultural restrictions on women -- including Iceland, Sweden, and Norway -- math scores for girls were as good as boys or better.
The biggest math score gender gap occurred in Turkey, where girls' scores lagged behind boys by 23 points. Turkey also scored among the lowest on the gender equity surveys.
The U.S. fell in the middle of the pack, with girls scoring 10 points lower on average in math than boys.