Prosocial Peers and Depressive Symptoms in Adolescence: A Time-Varying Effect Model

The present study contributed an investigation of prosocial peers, a prospective promotive factor, and its association with depressive symptoms, an internalizing outcome. The study utilized six waves of panel data from 2,002 youth in the control condition of the Community Youth Development Study (mean age 13.12 at Grade 7; 52% male; 66.1% White; 26.6% Hispanic). A series of time-varying effect models (TVEM) illustrated the associations between prosocial peers and depressive symptoms over developmental time from Grades 7 through 12. It was hypothesized that prosocial peers and depressive symptoms would have a negative association for both males and females, and that the association would be moderated by gender at the time of transition to high school. It was expected that females would display a significantly stronger negative association than males between prosocial peers and depressive symptoms at this juncture, particularly due to gender-based differences in socialization that are compounded by transition. To strengthen conclusions about prosocial peers being a promotive factor, secondary analyses included covariates measuring previous levels of depressive symptoms; these models accounted either for baseline depressive symptoms or year-prior symptoms. Results showed, overall, prosocial peers had a significant negative association with depressive symptoms over time, for both males and females. When controlling for baseline depressive symptoms, this was still the case. When controlling for year-prior depressive symptoms, prosocial peers was no longer significantly associated with depressive symptoms for males across Grades 10 through 12. Gender moderated the association between prosocial peers and depressive symptoms at the time of transition to high school as well as other grades. When controlling for baseline depressive symptoms, it was again found that gender moderated the association between prosocial peers and depressive symptoms at the time of transition to high school (Grades 8 and 9) but also at Grade 12. When controlling for year-prior depressive symptoms, gender did not moderate the association at the time of transition to high school, but it did at Grades 10, 11, and 12. Overall, results support the possibility of prosocial peers as a prospective promotive factor for youth mental health.