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Psychometric properties of a portuguese version of the SOCRATES 8D: a study with a sample of heroin addicts in treatment
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In the present study, we adapted the Stage of Change Readiness and Treatment Eagerness Scale (SOCRATES, version 8D) to the European Portuguese and we examined its factor structure and psychometric properties. The scale was applied to a sample of 100 adults, mostly heroin addicts, in outpatient or inpatient treatment. A Principal Component Analysis applied to the data revealed three dimensions - Problem Recognition, Taking Steps and Ambivalence -, corresponding almost exactly to the factor structure originally proposed by Miller and Tonigan (1996). The reliability indices for SOCRATES three subscales (internal consistency and temporal stability) were adequate. External validity study showed that the subscales differentiated treatment contexts and were associated to the participants' evaluation regarding the treatment expectations and the technical team. Thus, the Portuguese version of SOCRATES 8D seems to possess the proper psychometric properties to evaluate drug addicts' treatment motivation.