Tehran University of Medical Sciences Iranian Journal of Psychiatry 1735-4587 6 1 2011 03 15 12 18 Giti Shams Department of Psychiatry, Tehran University of Medical Sciences, Tehran, Iran Hosein Kaviani Department of Psychiatry, Tehran University of Medical Sciences, Tehran,Iran Yaghob Esmaili Department of Psychology, Rood-e-hen Azad University, Tehran, Iran Narges Ebrahimkhani Department of Psychiatry, Tehran University of Medical Sciences, Tehran, Iran Alireza Amin Manesh Treatment & Health Network of Rey State 2015 10 14 Objective: The psychometric properties and factor structure of the Persian Padua Inventory Washington State University Revision (PI-WSUR), a measure of obsessive- compulsive phenomena, was examined in a non-clinical sample of 348 Iranian university students. Method: The PI-WSUR was translated into Persian, and its back translation was controlled by the author inventory. A pilot study based on cultural differences was carried out on twenty students. The study subjects consisted of 348 university students, and they completed PPI, OCI-R, MOCI, BAI, STAI, BDI-II and the demographic inventory. Results: The factor analysis of the PI-WSUR, exhibited eight factors similar but not identical with factor structure in previous studies. as the eight factors are as follows: contamination obsessions; washing compulsions; ordering compulsions; checking compulsions; obsessional thoughts to harm self/others; obsessional thoughts about violence; obsessional impulses to harm self/others; and obsessional impulses to steal. The result also indicated excellent internal consistency (Cronbach alpha= 0.92), Spearman split test (0.95) and test- retest (r= 0.77). We assessed the concurrent validity of the PPI in relation to the Obsessive Compulsive Inventory-Revised (OCI-R), and the Maudsley Obsessive- Compulsive Inventory (MOCI). Conclusion:The Iranian version of the PI to some extend remains the sound psychometric properties of the original version. https://ijps.tums.ac.ir/index.php/ijps/article/view/336 https://ijps.tums.ac.ir/index.php/ijps/article/download/336/332