About 9 % of 15-year olds in the OECD reported being subject to cyberbullying …

„About 9 % of 15-year olds in the OECD reported being subject to cyberbullying although the share could be higher as victims are often reluctant to self-report. In 24 of the 28 countries for which data were available, young girls […] were more likely than boys to report having been cyberbullied, but they are also more likely to chat online daily or almost daily than boys.“
OECD (Hrsg.), Going Digital (2019), S. 111.