Supplementary Material for: Do Proximal Risk Factors Mediate the Impact of Affect on Symptoms of Generalized Anxiety Disorder and Major Depressive Disorder? An Extension of the Hierarchical Model of Cognitive Vulnerability

Background: Major depressive disorder (MDD) and generalized anxiety disorder (GAD) are among the most prevalent forms of psychopathology. The hierarchical model of cognitive vulnerability proposes that higher order risk factors explain co-occurrence among internalizing disorders, whereas lower order risk factors explain discordance. Methods: Participants (N = 646; mean age = 38.50, SD = 10.00; 49.2% female) were recruited from Amazon MTurk to complete self-report questionnaires related to psychopathology in the summer of 2020. Structural equation modeling was used to examine the relations that negative affect (NA) and positive affect (PA) share with MDD and GAD, through rumination and intolerance of uncertainty (IU), cross-sectionally. Results: When modeling both IU and depressive rumination together as explaining the indirect effects from affect to psychopathology, the association between NA and symptoms of MDD was explained by depressive rumination. There were no indirect effects from PA to MDD or GAD symptoms. When modeled separately, both risk factors explained the associations NA shared with MDD and GAD symptoms. Conclusions: The present study extends the hierarchical model of cognitive vulnerability by finding that depressive rumination explains the association between NA and symptoms of MDD, even when controlling for IU