LAUSR

INTRODUCTION The mechanism underlying the positive longitudinal link between adolescents' friendship quality and their well-being is unclear. The present study was performed to investigate whether this longitudinal association between friendship quality and well-being was established via adolescents' global self-esteem, and to examine gender differences in these associations. METHODS Online questionnaire data were collected in two waves (in Spring 2018 and Spring 2019) from 1298 Dutch adolescents aged 11-17 years (mean age 13.7 ± 1.1 years, 53.2% girls). RESULTS Multigroup path analyses revealed a significant indirect effect between friendship quality and well-being over time via global self-esteem for girls. For boys, significant direct effects of friendship quality on global self-esteem and well-being were found, but no significant indirect effect. CONCLUSIONS The findings indicate that higher-quality friendships improve boys' global self-esteem and well-being directly, and that they affect girls' well-being indirectly and positively, by improving their global self-esteem. These results suggest that preventive and intervention-based strategies for the promotion of well-being during the developmental stage of adolescence should incorporate focus on friendships, global self-esteem, and gender specificities.