Shear, K., Jin, R., Ruscio, A. M., Walters, E. E., & Kessler, R. C. (2006). Prevalence and correlates of estimated DSM-IV child and adult separation anxiety disorder in the National Comorbidity Survey Replication. The American journal of psychiatry, 163(6), 1074–1083. https://doi.org/10.1176/ajp.2006.163.6.1074

Michigan State University

While adult SAD has historically received less attention than childhood separation anxiety, research indicates that it is a prevalent and clinically significant condition. 
The National Comorbidity Study Replication was the first large-scale epidemiological study to include the diagnosis, revealing a lifetime prevalence of 6.6%.

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