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Zwei Drittel des sozioökonomisch bedingten Rückstands schon mit 10 Jahren ...

„Among 10-year-olds, the gap in mathematics performance related to socio-economic status is about two-thirds the size of that observed among 25-29 year-olds, on average across 12 OECD countries with comparable data.“
OECD (Hrsg.), „PISA in Focus 89“ (Oktober 2018), S. 2