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About 15 % of the variation in students’ mathematics performance can be explained by their socio-economic background ...

„On average across OECD countries, about 15 % of the variation in students’ mathematics performance can be explained by their socio-economic background. The countries where the variation in PISA mathematics performance can be explained to a larger extent by socio-economic background are the Slovak Republic, Chile, Hungary and France.“
OECD (Hrsg.), „Government at a Glance 2015“ (2015), S. 186