“…As individual SUD clinical trials are too short and small to yield stable estimates, pooling participants across trials creates more stable estimates. Similarities in the CTN participant characteristics population provide a rationale for pooling across trial, such as socioeconomic status, racial and ethnic groups, employment status, and educational level (Calsyn et al, 2009; Campbell et al, 2010; Carroll et al, 2006; Donovan et al, 2013; Hien et al, 2010; Hien et al, 2009; Horigian, Robbins, Dominguez, Ucha, & Rosa, 2010; Korthuis et al, 2012; Kropp et al, 2013; Masson et al, 2013; Meade et al, 2010; Svikis et al, 2012; Weiss et al, 2011; Winhusen, Winstanley, Somoza, & Brigham, 2012; Woody et al, 2008). Participants were typically recruited from community-based substance abuse treatment programs (CTPs) within the CTN network (McCarty et al, 2008) and trials were designed by NIDA CTN investigators with common goals of bridging practice with substance abuse treatment research results (Tai et al, 2010; Wells, Saxon, Calsyn, Jackson, & Donovan, 2010b).…”