Abstract Across the globe, women choose science, technology, engineering, and mathematics majors (STEM) less often than men. One frequently suggested explanation of this gender gap is that women perform less well in math and better in language than men in secondary school and have a comparative advantage in language. Studies for the Anglo-Saxon context have only found weak support for this school performance explanation due to small gender differences in math performance and comparative (math-to-language) grade advantages and weak effects of comparative test advantages on STEM major choice. We aim to contribute to the literature by assessing the role of math and language competencies and grades in explaining the gender gap in STEM major choice for Germany, a country with considerable gender differences in math and language performance. Decomposition analyses of the gender gap in STEM major choice in higher tertiary education among upper secondary students from the German National Educational Panel Study show that math and language performance can explain nearly half of the gender gap in STEM major choice. The role of math competencies and grades in the German language proves especially important due to substantial gender differences herein and strong effects on the likelihood of STEM declaration. Our findings suggest that in contexts with strong gender differences in math and language performance, prior school performance can to a large extent explain women’s underrepresentation in STEM university majors.
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