Evidently, the school climate is important in reducing adolescent problematic online game use (POGU); however, the mechanism accounting for this association remains largely unknown. This study examined whether loneliness mediated the link between school climate and adolescent POGU and whether this mediating process was moderated by adolescent intentional self-regulation. To this end, self-report questionnaires were distributed. Participants were 500 12–17-years-old Chinese adolescents (Mean_age = 13.59 years, 50.60% male). After controlling for adolescents' gender, age, family socioeconomic status, and self-esteem, the results showed that the negative association between school climate and adolescent POGU was partially mediated by loneliness. Moreover, this indirect link was stronger for adolescents with low intentional self-regulation than for those with high intentional self-regulation. These findings highlight loneliness as a potential mechanism linking school climate to adolescent POGU and provide guidance for the development of effective interventions for addressing the adverse effects of a negative school climate.

This study aimed to develop and validate a self-report instrument—the Perceived Teacher Trust Behavior Scale (PTTBS)—to assess primary school students’ perceptions of trust-related behaviors exhibited by their teachers. Adopting a child-centered perspective within the school context, we first conducted in-depth interviews and applied a grounded theory approach to identify dimensions and generate initial items. A cluster sampling method was used to recruit 1400 students (Grades 3~5) from three schools in Guizhou Province, China, who completed the questionnaire. The collected data were analyzed via exploratory factor analysis and confirmatory factor analysis using SPSS 30.0 and Mplus8.10 software. The final version of the PTTBS consists of 13 items across four dimensions: Emotional Support, Competence Recognition, Academic Support, and Moral Recognition. The scale demonstrated excellent internal consistency (Cronbach’s α = 0.90) and split-half reliability (Spearman–Brown coefficient = 0.847). Significant correlations with an established Student-Teacher Relationship Scale were observed, along with good convergent validity (0.502~0.629) and construct validity. The PTTBS exhibits robust psychometric properties and serves as a valid tool for measuring Chinese primary school students’ perceptions of teacher trust behaviors, suitable for both research and practical applications.