“…In addition to these two methodological procedures, the dropouts were included in the treatment group (n ϭ 331), allowing for a conservative evaluation of the intervention effectiveness. Overall, the results are consistent with cognitive-behavioral intervention efforts among offenders (Di Placido, Simon, Witte, Gu, & Wong, 2006;Henning & Frueh, 1996;Landenberger & Lipsey, 2005;Matthew & Pitts, 1998;McGuire et al, 2008;McGuire & Hatcher, 2001;Palmer, 1996;Pearson, Lipton, Cleland, & Yee, 2002;Timmerman & Emmelkamp, 2005;Wilson et al, 2005;Tong & Farrington, 2008).…”