Stages of Change in Methadone Maintenance: Assessing the Convergent Validity of Two Measures


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Abstract

This study compared 2 alternate measures of stage of changeas conceived by J. O. Prochaska and C. C. DiClemente. A sample of276 methadone maintenance patients completed both categorical anddimensional measures of stage of change regarding quitting illicitdrug use. The categorical measure places participants into 1 of 5stages based on their stated intentions regarding future illicitdrug use. The University of Rhode Island Change Assessment scale (URICA) provides continuous scores on 4 stage-of-change scales. Confirmatory factor analysis was used to assess the URICA's factorstructure. The relationship between URICA scores and self-reporteddrug use was also assessed. Comparison of the URICA and thecategorical measure using discriminant function analysis indicatedlimited convergence between the 2 measures and suggests that theymay assess different aspects of readiness to change.

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