Are personality characteristics related to substance abuse treatment outcome?: Using the Minnesota Multiphasic Personality Inventory-2 Personality Psychopathology Five to evaluate influences of personality characteristics on substance abuse treatment outcome.

摘要

What patient personality characteristics contribute to substance abuse treatment outcome? This study utilized data collected from a substance abuse treatment sample to explore the relationship between personality characteristics as measured by the Minnesota Multiphasic Personality Inventory-2 (MMPI-2) Personality Psychopathology Five (PSY-5) and substance abuse treatment outcome. The main research questioned the differences between treatment outcome groups (Completed, Left Against Medical Advice, and Referred) and the MMPI-2 PSY-5 Scales when administered during the first month of treatment. Five hypotheses were generated for each of the PSY-5 scales and their relationship to substance abuse treatment outcome. The PSY-5 scales measure Aggressivness, Psychoticism, Disconstraint, Negative Emotionality-Neuroticism, and Introversion-Low Positive Emotionality. All five scales were hypothesized to exhibit a significant relationship with substance abuse treatment outcome. A total of 261 participants from a substance abuse treatment sample were administered the MMPI-2 and a demographic questionnaire between 2 and 4 weeks of admission. MANOVA and ANOVA analyses yielded nonsignificant differences between and relationships among the PSY-5 personality characteristics and substance abuse treatment outcome. ANOVA and descriptive analyses conducted on the demographic variables revealed a significant positive relationship between education level and treatment outcome. Multiple regression conducted on the PSY-5 scales using the [MMPI-2] normative sample and this substance abuse sample indicated significantly higher scores on Psychoticism, Constraint, Negative Emotionality-Neuroticism, and Introversion-Low Positive Emotionality compared with a normal population. These results suggest that the MMPI-2 PSY-5 may not be a valid predictor of personality characteristics in relation to treatment outcome. Further PSY-5 testing on various demographic and clinical samples as well as additional considerations for exploring MMPI-2 personality differences and effects on substance abuse treatment are discussed.