Validation and Psychometric Properties of Self-Confidence Questionnaire (PEI)

Background and Objectives: Self-confidence is an individual characteristic in students that enables them to have a positive or realistic view of themselves. The purpose of present study was to evaluate the validity and psychometric properties of the Self-confidence Questionnaire (PEI)   Methods: This cross-sectional study was conducted on 100 students of four medical universities. Validation of this questionnaire included the steps of translation, content validity, face validity, repeatability and internal consistency.   Results: The mean age of the participants in this study was 32.1 (SD = 5.5) years. The majority of the students were postgraduate students (47%) and the least (11%) were undergraduate students. The results of this study showed that the overall relevancy and clarity of the questions were 92% and 83%, respectively. The percentage of agreement on overall comprehensiveness was 100%. Cronbach's alpha coefficient and interclass correlation coefficient were higher than 0.7 in all domains. The ICC of each question was also between 0.72 and 0.98.   Conclusion: Based on the results of this study, the Persian version of the PEI questionnaire has an appropriate reliability for use in the student population of Iranian universities.