“…Although some studies have found no differences on measures of externalizing problems with males and females (Berry, et al, 1985;Biederman, et al, 1999;Breen & Altepeter, 1990;Brown, Madan-Swain, & Baldwin, 1991;Castellanos, et al, 2000;Hom, Wagner, & Ialongo, 1989;James & Taylor, 1990;Kashani, Chapel, Ellis, & Shekim, 1979;Sharp, et al, 1999;Silverthorn, Frick, Kuper, & Ott, 1996), the majority indicate that boys display more externalizing behaviors, such as aggression, hyperactivity, and conduct problems, than girls (Arcia and Conners, 1998;Arnold, 1996;Barkley, 1998;Bauermeister, 1992;Befera & Barkley, 1985;Berry, et al, 1985;Biederman, Newcom, et al, 1991;Bird, et al, 1993;Carlson, Tamm, & Gaub, 1997;deHaas & Young, 1984;Erne, 1992;Gaub & Carlson, 1997b;Gershon, 2002;Hartung, et al, 2002;Heptinstall & Taylor, 1996;Hinshaw, 2002;Leadbeater, Kupermine, Blatt, & Hertzog, 1999;Lewinsohn, et aI., 1993;Lumley, et aI., 2002;McDermott, 1996;Newcom, et aI., 2001;Waschbusch, 2002;Zahn-Waxler, 1993). The current results support the bulk of the research and demonstrated that on all parent and teacher ratings of externalizing behaviors, males showed significantly higher scores than females.…”