„Between 2003 and 2015, students’ sense of belonging at school seems to have weakened. On average across 30 OECD countries with comparable data, over those 12 years the proportion of students who reported feeling like an outsider at school increased by 10 percentage points, from 7% to 17%. Similarly, the proportion of students who reported feeling awkward and out of place in their school increased by 9 percentage points, and the proportion of students who reported feeling lonely increased by 7 percentage points.“
OECD (Hrsg.), „PISA in Focus 100“ (September 2019), S. 2