The American journal of psychiatry
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The author reviewed the epidemiology and comorbidity of anxiety disorders in the elderly. ⋯ Epidemiologic data on the prevalence of posttraumatic stress disorder (PTSD) and the first occurrence of generalized anxiety disorder and PTSD in late life are still needed. Further comorbidity studies are needed to determine the extent to which anxiety arises secondary to depression, as well as the optimal treatment and prognosis for this mixed state.