The Millon Clinical Multiaxial Inventory II (MCMI-II), a well-known self-reporting instrument, was used in a prospective study of drug abusers from 21 treatment programs in Norway (n = 481) to investigate the influence of substance abuse on the reliability and stability of the MCMI personality traits at intake to treatment and after 7 years (n = 342).
As regards the drug-abusing and drug-free subgroups, the MCMI-II dimensional scores were equally reliable and stable in both groups, and were not influenced by the abusing state. Using the MCMI-II in a categorical diagnostic way did not show sufficient predictive validity. The MCMI-II dimensional scores should therefore be used to measure personality disorder traits among help-seeking and former drug abusers.
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