Psychometric Properties of Iranian Version of Clustera Personality Disorder Questionnaire

Objective: This study was conducted to determining psychometric properties of Cluster A personality Disorder Questionnaire in Iran.

Methods: This was a methodology study. Statistical population consisted of 1375 students of Islamic Azad University North Branch. Central Branch, Roudehen Branch and Karaj Branch selected using random sampling method. Of completed 1375 questionnaires, 1303 questionnaires were selected because of invalid and malformed collected questionnaires. Data were analyzed using descriptive statistics-mean, standard deviation inferential statistics- determination coefficient, and Cronbach’s alpha- to examine validity and reliability of test; Millon Personality Disorder Questionnaire considered as external benchmark. In addition, t and z tests were used for standardization.

Findings: Results showed the obtained Cronbach’s alpha for subscales including Paranoid, Schizoid, and Schizotypal equal to 0.610- 0.674 and 0.650 respectively. Internal consistency of questionnaire items was significant based on Cronbach’s alpha at level of 0.05 (P<0.005) indicating internal stability, validity and reliability of test. Evidences from simultaneous validity correlation indicated positive and significant correlation between scores of two tests.

Discussion and Conclusion: It can be stated in accordance with the results obtained from study that Cluster A Personality Disorder Questionnaire is a valid and reliable instrument to diagnose clinical symptoms of cluster A personality disorder in Iranian community.