“…Overall, COD appears to be negatively associated with treatment retention (Comfort & Kaltenbach, 2000) and completion (Green, Polen, Dickinson, Lynch, & Bennett, 2002;Mangrum, 2009) and positively associated with relapse or return to treatment (Bradizza, Stasiewicz, & Paas, 2006;Ilgen, Hu, Moos, & McKellar, 2008;Luchansky, He, Krupski, & Stark, 2000;Moos, Pettit, & Gruber, 1995;Rush, Dennis, Scott, Castel, & Funk, 2008), although findings have varied by mental disorder and diagnostic measures. Mixed results have also been reported with regard to gender differences in the relationship between COD and treatment outcomes (Galen, Brower, Gillespie, & Zucker, 2000;Greenfield et al, 1998;Kranzler, Del Boca, & Rounsaville, 1996;Mann, Hintz, & Jung, 2004;Walitzer & Dearing, 2006;Westermeyer, Kopka, & Nugent, 1997).…”