Reliability, validity, and factorial analysis of a short form of the Inventory of Interpersonal Problems in an Iranian population

Abstract Interpersonal problems are difficulties that an individual experiences in relating to others and are sources of subjective distress. These are among the most prevalent complaints that patients report during clinical interviews and are a major reason that people seek psychotherapy. The main purpose of this study was to examine reliability, validity, and exploratory factor analysis of a short form of the Inventory of Interpersonal Problems (IIP-60) in an Iranian general population. Nine hundred and twenty one volunteers (490 females, 434 males) from the general population in Tehran, Iran were included in this study. All participants were asked to complete the Inventory of Interpersonal Problems (IIP; Horowitz, Rosenberg, Baer, Ureno, & Villasenor, 1988), the Mental Health Inventory (MHI-28; Besharat, 2009), the Self-Esteem Rating Scale (SERS; Nugent & Thomas, 1993), and the Emotional Intelligence Scale (EIS; Schutte, Malouff, Hall, Haggerty, Cooper et al., 1998). Results of explarotary factor analysis supported six factors for the IIP-60 as well as a single general factor for interpersonal problems. The convergent and discriminant validity of the IIP-60 were supported by an expected pattern of correlations between the scale and the measures of mental health, self-esteem, and emotional intelligence. All correlation coefficients between the mean scores on the IIP-60 and scores of the MHI-28, the SERS, and the SEI were statistically significant. Coefficient alpha estimates of internal reliability were between. 84 and. 95 for the IIP-60 subscales. Test-retest reliability of the IIP-60 was also calculated at the range of. 74-.84. All correlations were statistically significant.