“…Homogeneity of samples and a lack of reporting on ethnicity in early research threaten the external validity of past findings. For example, three samples consisted of predominantly white males (Kennedy, 1989;Curulla, 1991;Leeman et al, 1993), racial demographic data were not available in other studies (Goldstein et al, 1989;Jones, 1991;Coleman et al, 1992;Gundersen & Svartdal, 2006), and only four experimental ART studies included multiethnic samples (Goldstein et al, 1987(Goldstein et al, , 1994Nodarse 1998;Nugent et al, 1999). Given that minorities are overrepresented compared to whites in the delinquent population (Glick, 2003) this shortcoming limits consumers' ability to comprehend findings' implications or replicate findings (Dowden, Antonowicz & Andrews, 2003).…”