Data in special populations are obtained from select studies. Special populations include adoptees from Eastern Europe in Sweden (521.1 per 1000 population; Landgren et al), foster and adopted youth referred to a US children’s mental health center (285.2 per 1000 population; Chasnoff et al), a correctional population in Canada (233.5 per 1000 population; Fast et al), an aboriginal population in Canada (189.7 per 1000 population; Robinson et al), a rural population with low socioeconomic status (SES) in South Africa (182.4 per 1000 population; de Vries et al), children in an orphanage in Brazil (170.2 per 1000 population; Strömland et al), a US population in psychiatric care (142.4 per 1000 population; Bell and Chimata), an aboriginal population in Australia (120.4 per 1000 population; Fitzpatrick et al), and children before adoption or in foster care in Israel (40.0 per 1000 population; Tenenbaum et al). Prevalence in the general population is described in Table 2. Error bars indicate 95% CI.