“…The majority of research on the characteristics of chemically dependent persons and the effectiveness of chemical dependency treatment programs has generally been conducted on all male or, more recently, mixed gender samples. Therefore, there is limited data on the characteristics of females in general and more specifically the pregnant population and how pregnancy affects the methadone user (Daley, Argeriou, & McCarty, 1998). Studies that have looked at gender differences in chemically dependent populations have often found that women compared to men have more severe psychological difficulties, have greater likelihood of physical and sexual abuse histories, and greater psychosocial problems (Arfken, Klein, di Menza, & Schuster, 2001;Brown, Melchior, Waite-O'Brien, & Huba, 2002;Chatham, Hiller, RowanSzal, Joe, & Simpson, 1999;Marcus, Hans, Patterson, & Morris, 1984).…”