This study examined whether self-esteem mediates the association between peer aggression and internalizing and externalizing problems in adolescents. A total of 204 Swedish adolescents aged between 12- and 16-years-old completed self-report measures; self-esteem was assessed with ‘I think I am’ (ITIA) and internalizing and externalizing problems with Youth Self-Report (YSR). Our results showed that internalizing problems in peer aggressors could be understood as problems with low self-esteem, while internalizing problems in peer victims could be understood both as problems with low self-esteem and as an effect of being victimized. Externalizing problems in peer aggressors and peer aggressor—victims could be understood as problems with being involved in peer aggression, while the same problems in peer victims could be understood as problems with low self-esteem. This article also discusses the importance of self-esteem in adolescents’ development of their own identities and for peer aggressive-related psychological psychopathology.
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