Joint developmental trajectories of anxious solitude and peer adversities from early childhood through adolescence: Characteristics and associations with indices of internalizing problems.

This study's aims were to identify distinct classes of youth exhibiting differing joint trajectories of anxious solitude (AS) and peer adversities from early childhood to adolescence and to examine relations between trajectory classes and the development of internalizing problems. A sample of 383 children (193 girls) was followed from kindergarten ( = 5.56 years) through Grade 12 ( = 17.89). Measures of AS, peer group rejection and victimization, loneliness, self-esteem, and depression were repeatedly administered across this epoch. Results revealed multiple joint-trajectory classes characterized by varying combinations of AS and peer adversity, and children in these classes differed in the development of internalizing problems over time. Consistent with diathesis-stress hypotheses, two types of peer adversities (stressors), peer group rejection and peer victimization, moderated the relations between children's propensity to engage in AS (diathesis) and the development of specific internalizing problems, including loneliness, depression, and low self-esteem. These findings suggest that socially vulnerable children (i.e., those high in AS) are particularly prone to developing internalizing problems in the face of peer adversity. (PsycInfo Database Record (c) 2025 APA, all rights reserved).