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Alcohol and Alcoholism Vol. 37, No. 1, pp. 93-99, 2002
© 2002 Medical Council on Alcohol

RELIABILITY AND VALIDITY OF THE DUTCH VERSION OF THE READINESS TO CHANGE QUESTIONNAIRE

L. Defuentes-Merillas1,2,*, C. A. J. Dejong2,3 and G. M. Schippers1

1 Amsterdam Institute for Addiction Research, Amsterdam,
2 Nijmegen Institute for Scientist Practitioners in Addiction, Nijmegen and
3 Network for Addiction Treatment Services, St Oedenrode, The Netherlands

Received 25 January 2001; first review notified 10 July 2001; accepted 9 August 2001

— The aim of the present study was to evaluate the psychometric properties of the Dutch version of the Readiness to Change Questionnaire (RCQ-D). The subjects were 246 excessive drinkers admitted to an addiction treatment centre and 54 offenders convicted of an alcohol-related crime in The Netherlands. The factor structure of the RCQ-D for the two samples combined was found to be consistent with the three-factor structure established for the original RCQ. The reliability of the items for each scale was found to be satisfactory. Allocated stage of change showed significant differences between the different subsamples. As expected, the scale scores for adjacent stages of change showed significantly higher inter-correlations than the scale scores for non-adjacent stages. Additionally, the negatively formulated items from the pre-contemplation scale were reformulated positively and their internal consistency tested among the offender sample. The positively formulated pre-contemplation items showed a higher alpha value than the negatively formulated items. We therefore suggest that the positively formulated items should replace the negatively formulated ones.


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