“…However, the odds of CUD relapse found in our study are much lower than those reported in studies of clinical samples (Catalano et al, 1990; Haney et al, 2010; Perkonigg et al, 2008; Price et al, 2001; Stephens et al, 1994a, 1994b; Witkiewitz and Marlatt, 2004), possibly due to lower average severity of CUD, less psychiatric comorbidity and health issues (Arendt et al, 2007a; Chen et al, 2011), and less exposure to high-risk environments (Benowitz, 2008; Lopez-Quintero et al, 2011; Piasecki, 2006), among community rather than clinical samples. However, exact comparisons with previous findings are difficult because of the different definitions of relapse, follow-up periods and specific characteristics of the samples included across studies (Okuda et al, 2010).…”