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.