> I've seen some ministries report a 50% success rate re curing addiction for people who join.
Ministries are not known for their careful scientific rigor in defining and measuring success rates. That 50% could be coming from any of a number of biases ranging from blatant to subtle: "How to have a high success rate in treatment: advice for evaluators of alcoholism programs", Miller & Sanchez-Craig 1996 http://slatestarcodex.com/Stuff/addiction.pdf is a semi-humorous paper from some frustrated researchers describing how these bogus numbers come about (discussion: http://slatestarcodex.com/2014/01/02/two-dark-side-statistic... ).
Ministries are not known for their careful scientific rigor in defining and measuring success rates. That 50% could be coming from any of a number of biases ranging from blatant to subtle: "How to have a high success rate in treatment: advice for evaluators of alcoholism programs", Miller & Sanchez-Craig 1996 http://slatestarcodex.com/Stuff/addiction.pdf is a semi-humorous paper from some frustrated researchers describing how these bogus numbers come about (discussion: http://slatestarcodex.com/2014/01/02/two-dark-side-statistic... ).