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A review that pooled surveys of mood disorders in different countries up to 2000 found 12-month prevalence rates of 4.1% for major depressive disorder (MDD), 2% for dysthymic disorder and 0.72% for bipolar 1 disorder. The average lifetime prevalence found was 6.7% for MDD (with a relatively low lifetime prevalence rate in higher-quality studies ...
In Europe, Africa, and Asia, lifetime rates of anxiety disorders are between 9 and 16%, and yearly rates are between 4 and 7%. [102] In the United States, the lifetime prevalence of anxiety disorders is about 29%, [103] and between 11 and 18% of adults have the condition in a given year. [102]
[12] [13] Studies conflict on the prevalence of depression in the elderly, but most data suggest there is a reduction in this age group. [14] Depressive disorders are more common in urban than in rural populations and, in general, the prevalence is higher in groups with adverse socio-economic factors (for example in homeless people). [15]
Mental, neurological, and substance use disorders make a substantial contribution to the global burden of disease (GBD). [12] This is a global measure of so-called disability-adjusted life years (DALY's) assigned to a certain disease/disorder, which is a sum of the years lived with disability and years of life lost due to this disease within the total population.
The World Mental Health Survey Initiative is a collaborative project by World Health Organization, Harvard University, University of Michigan, and country-based researchers worldwide to coordinate the analysis and implementation of epidemiological surveys of mental and behavioral disorders and substance abuse in all WHO Regions. [1] [2]
Generalized anxiety disorder (GAD) is an anxiety disorder characterized by excessive, uncontrollable and often irrational worry about events or activities. [5] Worry often interferes with daily functioning, and individuals with GAD are often overly concerned about everyday matters such as health, finances, death, family, relationship concerns, or work difficulties.
The National Comorbidity Survey of over 8,000 American correspondents in 1994 revealed 12-month and lifetime prevalence rates of 7.9 percent and 13.3 percent, respectively; this makes it the third most prevalent psychiatric disorder after depression and alcohol use disorder, and the most common of the anxiety disorders. [199]
A diverse range of topics are covered as they relate to anxiety disorders and is inclusive of disorders that were previously categorized as anxiety related disorders (obsessive-compulsive disorder, posttraumatic stress disorder) in addition to the new category of illness anxiety disorder.