That depends on a number of variables:
Intervention can be anything from threatening to move out of the home, to edicts from a judge, to a clinically planned and executed process involving family, employer, friends and other people important to the alcoholic. The last is the preferred method.
The individual must be in a mental state where he or she is vulnerable to the massed pleas of the people in his or her life. If their life is going fine, no problems that they can perceive -- and if they are the kind of person who actually isn't much affected by the cares and needs of others -- then the attempt is probably doomed to failure.
If "success" means getting them into treatment, then the rate is fairly high: probably around 50%. If it means completing a full course of treatment and aftercare, the success rate is substantially less.
If success is measured by continuous sobriety from the point of entering treatment until death (with, perhaps, one or two short relapses before continuity, it is probably in the 15 - 20% range at most.
The problem with statistics is that, by Federal Statute, alcohol treatment is seriously confidential. Furthermore, outcomes over time are pretty much a guess, since it is pretty hard to track people whose treatment was confidential to begin with, many of whom have no desire to remain in contact with the treatment facility. Thus, these are educated guesses based on the literature and our personal experience with people in treatment and their subsequent progress.
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The success rate of alcohol intervention can vary depending on factors such as the individual's level of commitment, the quality of the intervention, and access to ongoing support. Success rates can range from 30-70%, with the most effective interventions typically incorporating a combination of counseling, support groups, and personalized treatment plans.