Trajectories and latent classes of school enjoyment in adolescence: Associations with peer victimization and mental health.

School enjoyment, as a measure of how much adolescents enjoy or value their school experience, has been extensively studied in Western cultures. However, our knowledge of school enjoyment, and particularly its changes and trajectories among adolescents living in non-Western cultures, is limited. The present study used 3-year longitudinal data to examine changes and trajectories in school enjoyment and their associations with social and relational factors, such as mental health problems and peer victimization, among Japanese middle school students. Participants were 281 Japanese students from two public middle schools (Time 1 M_age = 12.72, SD = .45, 50% female). Data included five time points at 6-month intervals (Grades 7-9). The growth curve model showed quadratic changes in school enjoyment overall; the mean of school enjoyment was relatively stable in Grades 7 and 8 but increased rapidly in Grade 9. In terms of individual differences in trajectories of school enjoyment, growth mixture modeling identified three distinct groups (i.e., groups of 44.8% increasing, 9.8% decreasing, and 45.4% stable). Compared to students in the other groups, students in the increasing group initially reported lower levels of mental health problems and experienced less relational and overt victimization. In contrast, the decreasing group reported higher levels of mental health problems and experienced more relational and overt victimization than the increasing group. The results inform us about the most adaptive group, which continued to show high levels of school enjoyment, and the most maladaptive group, which initially had lower levels of school enjoyment and decreased their levels over time. The latter group of students is at risk and requires immediate intervention. (PsycInfo Database Record (c) 2025 APA, all rights reserved).