psychometric properties of the persian version of the padua inventory: washington state university revision (pi-wsur).

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.