„In countries where the proportion of 15-year-old students with an immigrant background (first and second generation) is above 6 %, immigrant students who reported that they attended ECEC for at least one year scored 36 score-points higher in the PISA science assessment than those who attended ECEC for less than a year or not at all. When accounting for student’s socioeconomic status, the difference in PISA scores of students with an immigrant background and different lengths of enrolment in ECEC is still significant at 25 score-points (i.e. 10 months of formal schooling).“
OECD (Hrsg.), Changing the Odds for Vulnerable Children (2019), S. 77.