The Study of Psychometric Properties of the Iowa Personality Questionnaire

Introduction: The aim of this study was to investigate the reliability, validity and factor analysis of the
Iowa Personality Questionnaire (IPQ) and its relationship with Big-Five Factors of personality
amongst the students of Azarbaijan Shahid Madani University as well as Tabriz University.
Method: The present study was a descriptive- correlational.500 students including 263 females and
237 males were randomly selected from Azarbaijan Shahid Madani University and Tabriz University.
Iowa personality questionnaire was administrated, and Neo-Five Factor Inventory (NEO-FFI)
questionnaire was completed by the samples. Data were analyzed using correlation, factor analysis,
and data variance analysis methods.
Results: Factor Analysis using principal component analysis with Varimax rotation identified three
factors positive emotionality, negative emotionality and constraint which could explain the%58.03 of
the variance. Test-retest reliability coefficient for total scores obtained 0.85 and for factors ranged
from 0.72 to 0.87. Concurrent validity of the scale was calculated according to correlation coefficients
between the score on the Iowa personality questionnaire and scales of Neo-five factor inventory.
Comparison of the male and female students showed that there was not a significant difference in
factors of Iowa personality questionnaire. However, there was a significant difference between the
male and female students in scales called aggression, harm avoidance, social closeness, and
Absorption. Finally, the results showed a good correlation between Iowa personality questionnaire and
Big-Five Factors of personality.
Conclusion: The results of this study supported the confirmatory factor structure, reliability and
validity of the Iowa personality questionnaire and its applicability to students' population.