Prevalence of Insomnia and Associated Factors in Outpatients With Generalized Anxiety Disorder Treated in Psychiatric Clinics.

Sleep disturbance is one of the key diagnostic criteria for generalized anxiety disorder (GAD). In this cross-sectional, prospective, observational, and multicenter study, factors associated with the prevalence of insomnia and the impact of insomnia-associated factors on quality of life were evaluated. Using multivariate analyses, the factor most strongly associated with the presence of insomnia (ISI ≥ 8) was the severity of the disorder (Odds Ratio [OR]: 9.253 for severe GAD; 95% Confidence Interval [CI]: 1.914-44.730; p = 0.006), pain interference and symptoms of depression (OR: 1.018; 95% CI 1.003-1.033; p = 0.016 and OR: 1.059; 95% CI 1.019-1.101; p = 0.004, respectively). Insomnia was not related to quality of life. Our results show insomnia to be a common health condition among patients with GAD, associated with the severity of anxiety and depressive symptoms and pain interference.