Adolescents' co-rumination and stress predict affective changes in a daily-diary paradigm.

Co-rumination has been related to both high quality friendship and depressive symptoms. However, little is known regarding the extent to which co-rumination may be detrimental, its distinction from rumination and potential gender differences in co-rumination. This study used a modified version of Rose's Co-rumination Questionnaire (Rose, 2002) to examine the behaviour of daily co-rumination with daily stress and negative affect among adolescents. Results demonstrated that co-rumination did not have a main effect in predicting negative affect, but did evidence a significant interaction with life stress. Additionally, co-rumination demonstrated incremental utility above that of rumination. Finally, gender differences were not supported. In conclusion, this investigation revealed that co-rumination exacerbates the effects of life stress and is predictive of increased internalising symptoms.