Usually, gender gaps in school enrollment and achievement are investigated as separate facets of gender inequality in education. This study suggests that they might be linked by design. If boys and girls differ in their school enrollment rates, the student population will be gender biased. Since out-of-school adolescents tend to be less advantaged than in-school ones, school-based large-scale assessments effectively compare a more fully represented group of one gender with a less represented and more advantaged group of the other one. This should shift student gender achievement gaps so that they favor the latter group. In country-level regression models using data from all PISA cycles, we indeed found evidence of a small, negative association between gender gaps in secondary school enrollment and gender gaps in student achievement. This finding is robust across different achievement domains and specifications. We discuss the study's limitations and implications for applied research with PISA data.
The Link between Gender Gaps in School Enrollment and School AchievementIn the field of education, gender differences in school enrollment and in school achievement represent two key facets of gender inequality. Both are crucial, since school enrollment is a prerequisite for participating in formal education and school achievement is intrinsically linked to students' actual learning success. These two gender gaps are also addressed in the United Nations' Sustainable Development Goal of quality education, which promises to "[b]y 2030, ensure that all girls and boys complete free, equitable and quality primary and secondary education leading to relevant and effective learning outcomes" (United Nations 2015, 19). In previous research, gender gaps in enrollment and achievement were usually investigated as two separate dimensions of gender-related educational inequalities. As outlined below, this study focuses on the link between these gender gaps.
Global School Enrollment Gender Gaps at the Primary and Secondary School LevelSince being enrolled in school is crucial for learning, school attainment, societal participation, and access to the labor market, policy makers across the world have long sought to increase enrollment rates and reduce gender differences in enrollment (e.g., OECD 2015; Quintini and Martin 2014; UNESCO 2019; World Economic Forum 2019). As illustrated in Figure 1, these political efforts appear to have been successful: Primary and secondary school enrollment rates increased over the last 30 years in lower and higher income countries. For the most part, gender gaps in school enrollment have also decreased. In low-and lower-middle-income countries, however, boys have retained average enrollment advantages at primary school level; in low-income countries this also applies at the secondary school level. Across upper-middle and high-income countries, boys' and girls' primary school enrollment rates are currently very high and almost equal. At the secondary school level, girls have higher average enrollment rat...