Study of Psychometric Properties of the International Index of Erectile Function (IIEF) in Substance Dependent Men

Erectile dysfunction is one of the problems caused by substance dependence, which is important to measure and evaluate. Therefore, the present research was conducted to study of factor structure, reliability and validity of the Persian version of the International Index of Erectile Function (IIEF) among substance dependent men.

The statistical population of this cross sectional study of males has substance abuse, who referred to the National Center for Addiction Studies, Addiction Treatment Clinics in Tehran. Using cluster sampling method, 450 participants were selected. Sexual Function Questionnaire (CSFQ-14) and International Index of Erectile Function (IIEF) were used to collect data.

An examination of the values of the factor loads indicates that the factor loads of all the questions on the principal component are satisfactory. Cronbach's alpha coefficient of International Index of Erectile Function (IIEF) was Desirable (P<0/01). Convergent validity of Correlation Coefficient in Sexual Function Questionnaire (CSFQ-14) with scales the International Index of Erectile Function (IIEF) was desirable (P<0/01). The findings also showed that there was a difference between employed and unemployed substance dependent men in sexual dysfunction, but no significant difference was observed in hospitalization history and education levels.

International Index of Erectile Function (IIEF) had good reliability and validity and therefore a good tool to use in the population have substance dependent in Iran. In prevention and treatment planning, it is necessary to pay attention to the demographic factors affecting the International Index of Erectile Function (IIEF).