What did a comparative study of several countries reveal about math performance and gender?

What a comparative study of several countries revealed about math performance and gender is that those countries where girls did better in math also tended to be the countries that score higher on other measures of gender equality.
So, in countries where men and women are completely equal, both men and women tend to be equally good when it comes to math and other things. This means that every country in the world should promote equality and fight for it.

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