How common attachment disorders are among children?
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No epidemiologic studies of frequency or prevalence of attachment disorders in children exist; however, statistical data regarding adoptions and foster care placement are available. On the basis of such data, it may be possible to estimate approximately how many children have attachment disorders. According to DSM-5, the prevalence of RAD in high-risk populations (ie, children severely neglected and placed in foster care or institutions) is less than 10%, and the prevalence of DSED in these populations is about 20%.
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@sanai The onset of attachment disorders comes before the age of 5 years. Typically, the disorder has its roots in infancy. The more serious effects of disruptions in attachment relationships tend to persist and manifest themselves in the preschool and school years. In more muted forms (eg, mistrust and difficulties in establishing supportive, sensitive, and intimate relationships), they last into adolescence and adulthood.