Stages of change in methadone maintenance: Assessing the convergent validity of two measures

Mark A. Belding, Martin Y. Iguchi, R. J. Lamb

Research output: Contribution to journalArticlepeer-review

51 Scopus citations


This study compared 2 alternate measures of stage of change as conceived by J.O. Prochaska and C.C. DiClemente. A sample of 276 methadone maintenance patients completed both categorical and dimensional measures of stage of change regarding quitting illicit drug use. The categorical measure places participants into 1 of 5 stages based on their stated intentions regarding future illicit drug 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 factor structure. The relationship between URICA scores and self-reported drug use was also assessed. Comparison of the URICA and the categorical measure using discriminant function analysis indicated limited convergence between the 2 measures and suggests that they may assess different aspects of readiness to change.

Original languageEnglish (US)
Pages (from-to)157-166
Number of pages10
JournalPsychology of Addictive Behaviors
Issue number3
StatePublished - Sep 1996
Externally publishedYes

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Clinical Psychology
  • Psychiatry and Mental health


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