“…One study reported no demographic differences between those who attend AA and those who do not (Humphreys, Mavis, & Stofflemayr, 1994). Other studies found that certain demographic groups, such as women (Humphreys, Mavis, and Stofflemayr, 1991), those with higher levels of education (Terra et al, 2007), and African Americans (Humphreys et al, 1991; Kelly & Moos, 2003) are more likely to attend or less likely to drop out of AA. Higher substance use severity and more family, social and psychological problems have been shown to be associated with later AA participation (Emrick, Tonigan, Motgomery, & Little, 1993; Humphreys et al, 1991).…”