Measuring state-specific rumination: Development of the Rumination About an Interpersonal Offense Scale.

The tendency to ruminate has been consistently linked to psychological disturbances, such as increased stress, anger, and fear in response to provocations. However, existing measures of rumination focus on the disposition to ruminate rather than on rumination about a specific situation. This limits the ability to explore rumination about a specific situation and makes the assessment of change as a result of time, contextual factors, or psychological interventions difficult. Across three samples, including a clinical sample, the reliability and validity of the Rumination About an Interpersonal Offense scale (RIO) was examined. Exploratory and confirmatory factor analyses provided support for a unidimensional structure. Internal consistency and test-retest reliabilities were adequate. Convergent and discriminant validity were also supported.