According to the study, conducted in 2015, 30.6% of 15-year-olds said they've been bullied several times a month. The OECD average is 18.7%.
Latvia is the second worst-performing country in this regard, behind Hong Kong.
Meanwhile 20.2% of Estonian schoolkids said they've been bullied several times a month, and the figure is 16.4% in Lithuania.
Nevertheless the research suggests that, despite bullying, Latvian teenagers generally feel well-off.
The part of the study that looks at schoolkids' reported stress over exams, their motivation, and the psychological and morale climate at school, gives Latvia 7.4 out of a possible 10.
The OECD average is 7,3 putting Latvia on par with richer countries like Germany.