“…On the basis of the Allen Barriers to Treatment Inventory (Allen, 1994), as well as other barrier lists (Grant, 1997;Rapp et al, 2006;Tucker et al, 2004), Rapp et al (2006) developed the Barriers to Treatment Inventory (BTI) to assess both the internal and external BDATs, and demonstrated the presence of four dimensions of internal barriers (i.e., absence of problem, negative social support, fear of treatment, and privacy concerns), as well as three dimensions of external barriers (i.e., time conflict, poor treatment availability, and admission difficulty). Further studies gave evidence that both demographic factors, such as gender, age, education, ethnicity, employment and marital status (Greenfield et al, 2007;Lundgren et al, 2001;Siegal et al, 2002), and drug abuse status, such as primary drugs use, drug treatment experience and duration of primary drug use (Davey et al, 2007;Gyarmathy and Latkin, 2008;Siegal et al, 2002), are closely associated with entry to treatment. Yet, those findings have not fully clarified how individual characteristics influence barriers to drug treatment.…”