Supplementary Material for: Symptom change during waitlist for medicated and nonmedicated patients with chronic depression

Introduction: Patients seeking psychotherapy often spend time on waitlist (WL), the effect of which is largely unknown. WL patients may forego alternative non-psychotherapeutic assistance and thus do more poorly than had they not been placed on a waitlist. The course of symptoms might also be influenced by use of antidepressant medication (ADM), an issue that remains unexplored in the literature. Objective: In a naturalistic setting, WL symptom change before inpatient psychotherapy (mean weeks of waiting = 22.6) was assessed in a sample (N=313) of chronically depressed patients. Methods: Using the Beck Depression Inventory-II, patients’ symptoms were tracked at assessment, when admitted to treatment (i.e., after waitlist), at post-treatment and 1-year follow-up. Multilevel growth curve analysis was used to examine wait list change for the whole sample as well as for ADM users and nonmedicated patients. Results: Symptoms were reduced significantly from assessment to admittance (Cohen´s d = .47). Symptoms reduced less for ADM users (d = .39) than for nonmedicated patients (d = .65). Conclusion: The findings indicate that chronically depressed patients experience a decrease in symptoms during waitlist, quite likely due to treatment expectations. We discuss whether less symptom improvement for ADM-users could be attributed to iatrogenic comorbidity and a higher degree of demoralization in this group.