The prevalence of generalized anxiety disorder and comorbidity among psychiatric outpatients

Objective: In this study, we aimed to investigate the prevalence, association with sociodemographic characteristics, and comorbidity with other anxiety and depressive disorders of generalized anxiety disorder (GAD) among psychiatric outpatients. Method: In the first phase of the study, outpatient psychiatry clinic physician interviewed with consecutive 950 patients who applied to psychiatry outpatient clinic of an university hospital by using GAD module of CIDI (Composite International Diagnostic Interview, version 2.1) during 4-month. Ninety-nine patients with diagnosis of GAD in the first phase were referred to the researcher physician for further evaluation. In the second phase, patients were interviewed by using CIDI anxiety and mood (major depression, dysthymic disorder) disorder modules. By this way, 12-month additional diagnoses were examined, and diagnosis of GAD was confirmed. One patient was excluded, because did not meet the GAD criteria during reexamination by the researcher physician. Results: Ninety-eight patients (10.3%) met DSM-IV criteria for GAD. Eighty-nine (90.8%) of the cases had comorbid any anxiety or depressive disorder. The rates of comorbidity with any of depressive disorders and anxiety disorders were found 84.7% and 56.1%, respectively. The most common comorbid diagnosis was major depression (83.7%). The most common anxiety disorders were social phobia (30.6%), OCD (19.4%) and specific phobia (17.4%). The prevalence of GAD was observed significantly higher in women, married ones, housewives, unworking girls, subjects with history of medical illness and lower educational status. Conclusion: Our results show that among psychiatric outpatients, GAD has high comorbidity rates with depressive and other anxiety disorders, and it is associate with some sociodemographic characteristics such as gender, and marital, working and educational status.