Objective: To present the results of a systematic review of literature published between 1980 and 2004 reporting findings of the prevalence and incidence of anxiety disorders in the general population.Method: A literature search of epidemiologic studies of anxiety disorders was conducted, using MEDLINE and HealthSTAR databases, canvassing English-language publications. Eligible publications were restricted to studies that examined age ranges covering the adult population. A set of predetermined inclusion and exclusion criteria were used to identify relevant studies. Prevalence and incidence data were extracted and analyzed for heterogeneity.Results: A total of 41 prevalence and 5 incidence studies met eligibility criteria. We found heterogeneity across 1-year and lifetime prevalence rates of all anxiety disorder categories. Pooled 1-year and lifetime prevalence rates for total anxiety disorders were 10.6% and 16.6%. Pooled rates for individual disorders varied widely. Women had generally higher prevalence rates across all anxiety disorder categories, compared with men, but the magnitude of this difference varied. Conclusion:The international prevalence of anxiety disorders varies greatly between published epidemiologic reports. The variability associated with all anxiety disorders is considerably smaller than the variability associated with individual disorders.Women report higher rates of anxiety disorders than men. Several factors were found to be associated with heterogeneity among rates, including diagnostic criteria, diagnostic instrument, sample size, country studied, and response rate. Clinical Implications · Significant heterogeneity in the prevalence of anxiety disorders signals the need for population-specific health policies and planning. · The prevalence of anxiety disorders eclipses the capacity of specialized mental health services. · Anxiety disorders remain prevalent throughout ages 18 to 64 years. Limitations· The observed heterogeneity may be related to environmental or cultural factors associated with the location of each contributing investigation. · Variance owing to methods of diagnosis and measurement account for a limited portion of the observed heterogeneity. · An insufficient number of incidence studies are available to clarify details concerning the onset of symptoms.

The prevalence of mood disorders reported in high-quality studies is generally lower than rates commonly reported in the general psychiatric literature. When controlled for common methodological confounds, variation in prevalence rates persists across studies and deserves continued study. Methodological variation among studies that have examined the prevalence of depression in primary health care services is so large that comparative analyses cannot be achieved.

Although we restricted this review to studies using rigorous and relatively homogeneous methods, there remains significant heterogeneity of prevalence and incidence rates. This strengthens support for the hypothesis that there is real variation in the distribution of schizophrenia around the world. Health planners need to have local data on schizophrenia rates to improve the accuracy of their interventions, while clinicians and researchers need to continue to investigate the etiology of this variation.

We examined culture-related influences on willingness to seek treatment for social anxiety in first- and second-generation students of Chinese heritage (Ns=65, 47, respectively), and their European-heritage counterparts (N=60). Participants completed measures that assessed their willingness to seek treatment for various levels of social anxiety. Results showed that participants were similar on willingness to seek treatment at low- and high-severity levels of social anxiety; however, at moderate levels, first-generation Chinese participants were significantly less willing to seek treatment compared to their European-heritage counterparts. The reluctance of first-generation Chinese participants to seek treatment was associated with greater Chinese-heritage acculturation, and was not related to perceiving symptoms of social anxiety as less impairing. The findings support the general contention that Asians in North America tend to delay treatment for mental health problems.

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