„The share of children who need language guidance differs strongly between those who speak German in daily life and those who use another language. While this share is 10 % for children whose colloquial language is German, it is 58 % for the children whose colloquial language is not German.“
OECD (Hrsg.), „Catching Up? Country Studies on Intergenerational Mobility and Children of Immigrants“ (2018), S. 26