Although participation in 12-step programs is now widely utilized as a treatment aftercare resource by individuals with drug and alcohol problems, little is known about the effectiveness of such a practice. This paper identifies gaps in the existing literature and articulates methodological concerns that may compromise investigations of 12-step programs. It highlights the need for additional after-treatment studies, and it presents findings from a 24-month longitudinal after-treatment study that suggests the effectiveness of 12-step programs. Rather than a behavioral indicator of recovery motivation or a spurious relationship confounded by additional treatment, aftercare, or alumni activities that occur simultaneously with 12-step participation, the findings suggest that weekly or more frequent 12-step participation is associated with drug and alcohol abstinence. Less-than-weekly participation is not associated with favorable drug and alcohol use outcomes, and participation in 12-step programs seems to be equally useful in maintaining abstinence from both illicit drug and alcohol use. These findings point to the wisdom of a general policy that recommends weekly or more frequent participation in a 12-step program as a useful and inexpensive aftercare resource for many clients.

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There is something of a gender paradox in drug user treatment. Research consistently indicates that women possess "risk factors" associated with drug use relapse, yet women are no more likely, and possibly less likely, to relapse to drug use. Efforts to explain this paradox involve a longitudinal study of 330 women and men participating in outpatient drug-user treatment associated with the evaluation of the Los Angeles Target Cities Project funded by the Center for Substance Abuse Treatment. The findings offer no support for the drug severity and social support hypotheses, but some support for the treatment engagement hypothesis. Specifically, women participate more frequently in group counseling which, in turn, lowers their rate of relapse in spite of having more "risk factors." Further analyses indicate that the greater participation of women in group counseling does not stem from child-custody or other gender differences in the reasons for entering treatment, nor does it result from the enhanced services associated with the Target Cities Project. Rather, the differences in treatment engagement for women and men may result from gender norms concerning help-seeking, personal independence, strength, and control. The treatment and policy implications of these findings and recommendations for further research are discussed.