“…However, other studies have concluded the opposite: substance abuse is associated with worse mental health, following epidemiological or clinical diagnostic criteria (Cuijpers, Smit, Have, & de Graaf, 2007;Farrell et al, 2003;Martínez-Ortega, Jurado, Martínez-González, & Gurpegui, 2006;Regier et al, 1990). However, an important difference between those studies and the present one is that the mental health was self-rated by the prisoners in the current study.…”