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Schools where the incidence of bullying is high by international standards ...

„Schools where the incidence of bullying is high by international standards (more than 10 % of students are frequently bullied) score 47 points lower in science, on average, than schools where bullying is less frequent (schools where less than 5 % of students are frequently bullied). This difference in performance between the two types of schools remains substantial (around 25 score points) even after accounting for differences in schools’ socio-economic profile.“

OECD (Hrsg.), „PISA In Focus 74“ (Juli 2017), S. 3