“…However, the extent of the over-representation has varied widely. While adopted children have been estimated to make up roughly 2 % of the population (Hersov, 1990 ;Zill, 1985b), adoptees have made up from 2.4 % to 21.2 % of these clinical samples (Canada : Jerome, 1986Jerome, , 1993Kostopoulos et al, 1988 ;UK : Goldberg & Wolkind, 1992 ; U.S.A. : Brinich & Brinich, 1982 ;Goodman, Silberstein, & Mandell, 1963 ;Kim, Davenport, Joseph, Zrull, & Woolford, 1988 ;Schechter, 1960 ;Senior & Himaldi, 1985 ;Warren, 1992).…”