Taking the transtheorical model of change of Prochaska and DiClemente as a reference, the aim of this study is to evaluate the stage of change in which are located 317 heroin addicts (250 men and 67 women), using a semi-estructurate interview. Also, it studies the predictive power of the stage of change, the social-demographic and toxicologic variables and types of treatment related to the adherence, measured a month, at three months, at six months, at nine months and twelve months.The results obtained show that the stage of change is not a potent predictive variable of the adherence to treatment, since it is only stadistically significative at a month and at 3 months. Other estudied variables predict adherence in all temporal points measured: age and type of treatment that begins. Previous treatments, maximum time of previous abstinence and the type of companionship tends to predict adherence in the last temporary points.
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