Psychometric properties of the greek version of Zuckerman-Kulhman Personality Questionnaire (ZKPQ) and its ability to predict the outcome of substitution therapy in Greece (Doctoral thesis)

Βαλμά, Βασιλική

The purpose of this research is the study of psychometric properties of the Greek version of the Zuckerman-Kuhlman Personality Questionnaire (ZKPQ), the study of patients’ progress of Substitution Treatment over a period of 4 years and the identification of the patients’ traits that could put them at risk of premature interruption of the methadone maintenance treatment. ZKPQ was translated into Greek and was administered to 1,462 participants (475 healthy participants, 619 medical patients, 177 psychiatric patients and 191 opiate addicts). Confirmatory and exploratory factor analyses were performed. SCL-90-R and HDHQ were administered to test criterion validity.The study of opioid addicts’ progress was held at the 4th Substitution Unit in Athens and 197 patients participated by completing the aforementioned questionnaires, as well as the DSQ and MMPI- Ego Strength. Furthermore, they answered the questions of EuropASI. In the follow up study, four years after the base-line 137 patients participated by completing the SCL-90-R and answering the EuropASI questions. The statistical analysis was carried out through parametric tests of the mean values, the testing of independence of categorical variables and multifactorial logistic regression analyses. The analyses of the psychometric properties of the Greek version of ZKPQ identified five factors corresponding to the original version’s respective factors. Retest reliabilities were acceptable (rli’s:0.79-0.89) and internal consistency was adequate for all factors, higher for Neuroticism-Anxiety (0.87) and lower for Sociability (0.64). Opiate addicts exhibited higher rates on Impulsive Sensation Seeking compared to healthy participants. Neuroticism-Anxiety (p<0.001) and Impulsive Sensation Seeking (p<0.001) were significantly associated with psychological distress and Aggression-Hostility was the most powerful correlate of Total Hostility (p<0.001), and Neuroticism-Anxiety was the stronger correlate of Introverted Hostility (p<0.001), further supporting the instrument’s concurrent validity.The Multifactorial Logistic Regression Analysis for the prediction of Program Retention showed that those who live alone (p=0.038), those that use alcohol (p=0.027) and Sociability of ZKPQ (p=0.035) affect in a negative way the probability of retention. Retention is positively affected by Activity of ZKPQ (p=0.001), Moral Attitude of the MMPI (p=0.025) and Interpersonal Sensitivity of the SCL-90-R (p=0.022). The model interprets the 31% of the variability of the dependent variable and the variables studied here affect significantly the prognosis of Program Retention (p=0.001). Four years after the first evaluation, the retention rates of the Program are quite high (79.2%) and there is a statistically important improvement in all the psychopathological symptoms, except for Depression and Phobic Anxiety. Moreover, there is a decrease of days of heroin use (p<0.001). Women reduce the heroin use more (p=0.002), those patients of lower education (p=0.043) as well as those who show improvement in General Symptom Index of the SCL-90-R (p=0.034). Present findings support the applicability of the Greek version of ZKPQ within the Greek population. The results of the present research intensify the need for evaluation of both the personality traits and the psychopathological symptoms during the entry of patients at the Substitution Programs so to prevent the risk of interruption of their treatment and ensure their good progress in it.
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών Υγείας. Τμήμα Ιατρικής
Subject classification: Ερωτηματολόγιο ZKPQ
Keywords: Ερωτηματολόγιο ZKPQ,Θεραπεία υποκατάστασης με μεθαδόνη,Προσωπικότητα και ψυχοπαθολογία εξαρτημένων από οπιοειδή,Μείωση της βλάβης,Παραμονή στο πρόγραμμα υποκατάστασης,ZKPQ questionnaire,Methadone substitution treatment,Personality and psychopathology of opioid addicts,Harm reduction,Retention of Substitution Programs
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