„PISA results show that across the OECD countries, students who had attended ECEC tend to have higher scores in academic proficiencies at the age of 15. However, these differences in academic proficiencies between those who attended ECEC versus those who did not attend are almost nil when students’ socio-economic status (SES) is considered.“
Jaime Balladares u. a., Attendance in Early Childhood Education and Care Program (2020), S. 4.