Modeling heterogeneity in the simultaneous emotional costs and social benefits of co-rumination.

Co-rumination is the act of perseverating on problems or negative emotions with another person. Past research has shown that co-rumination has tradeoffs, as it is related to more anxiety and depressive symptoms, yet also heightened feelings of closeness and better relationship quality. However, there has been little repeated measures work, leaving unknown the influence of within-person changes in co-rumination on individuals' functioning. Using data from 1,504 adolescents collected as part of a seven-wave study over 4 years, we hypothesized that at times when adolescents coruminated above their own average level of co-rumination, they would report more anxiety and depressive symptoms, as well as increased closeness with friends at concurrent timepoints. Moreover, we investigated heterogeneity in these effects, exploring whether there was variability in whether adolescents experienced simultaneous costs and benefits of increased co-rumination. The results reveal that the average adolescent reported associated increases in anxiety symptoms, depressive symptoms, and closeness with friends at times when they reported coruminating at higher-than-typical levels. Yet, there was significant heterogeneity in these effects, as some adolescents solely experienced costs of co-rumination and others experienced just benefits. Moreover, adolescents who experienced stronger-than-average effects of co-rumination on anxiety and depressive symptoms reported less of an increase in closeness with friends. These findings offer important insight into how co-rumination is associated with social-emotional functioning and have implications for recommending best practices for seeking support and discussing problems with close others. (PsycInfo Database Record (c) 2021 APA, all rights reserved).