Naturalistic interpersonal behavior patterns differentiate depression and anxiety symptoms in the community

Symptoms of depression and anxiety are associated with interpersonal problems that, in turn, exacerbate and maintain these symptoms. The purpose of the present study was to identify patterns of interpersonal behavior characteristic of each syndrome, particularly whether intraindividual variability in interpersonal behavior differentiates between anxiety and depression symptoms. After reporting on depression and anxiety symptoms, community participants recorded their behavior following interpersonal interactions over 21 days. Participants' interpersonal behavior at each event was measured using behavior dimensions from the interpersonal circumplex: dominant, submissive, agreeable, and quarrelsome. Mean levels of behavior and intraindividual variability were computed over events and then regressed on depression and anxiety symptoms using structural equation modeling. Elevations in reported depression and anxiety symptoms were both associated with elevated mean-level quarrelsome and submissive behavior. Independent of mean-level behavior and concurrent depression symptoms, elevated anxiety symptoms were associated with elevated variability in agreeable, dominant, and submissive behavior and with elevated variability in type of interpersonal behavior (i.e., spin). Depression symptoms were unrelated to variability in interpersonal behavior. Results demonstrate that variability in behavior distinguishes anxiety from depression symptoms.