Adolescent Interpersonal Behaviours and Mental Health Across Two Swedish Cohorts: 15-Year Trends and One-Year Bidirectional Associations in a Mixed-Methods Study
Background and AimsAdolescent mental health has declined in recent decades. Few studies have explored whether shifts in interpersonal behaviours– both in-person and online– can help explain this decline. Using data from two Swedish cohorts (2007–2008, 2023–2024), we examined (1) 15-year time trends (2007–2008 vs. 2023–2024) in interpersonal behaviours (victimization, aggression, prosocial behaviou
