Proportion criterion. Thinking of loadings = 0.five as minimum criteria for factor loadings, 7 out of 10 concerns from psychoticism ,and three out of six questions from paranoid ideation had been retained, and others have been eliminated. The factor labels proposed by the questionnaire suited the extracted variables and have been retained. Internal consistency for each from the dimensions was acceptable (Cronbach’s alpha 0.7 and 0.74 for paranoid ideation and psychoticism respectively). Composite scores showed a half-normal distribution for both dimensions which can be predictable for instruments that detect psychotic symptoms. Conclusion: Final results had been in contrast with equivalent research, and questioned them by suggesting a distinct aspect structure obtained from a statistically huge population. The population within a building nation (Iran) in this study as well as the socio-cultural variations in created settings would be the prospective sources for discrepancies among this analysis and preceding reports. Search phrases: Mental wellness, Paranoid issues, Psychological Tests, Psychotic symptoms, Statistical element analysisIran J Psychiatry 2011; six:128-assess the psychological symptom status of men and women from “healthy controls” to “disordered ones” (1). It consists of 90 qu estions defined in 9 s ymptoms dimensions (depression, anxiety, phobic anxiousness, hostility, obsessive-compulsive, interpersonal sensitivity, somatization, paranoid ideation and psychoticism dimensions). A fantastic degree of consistency and test-retest reliability has been reported for SCL90R (2, three). The application of the instrument, with particular concentrate on two dimensions of psychosis (paranoid ideation and psychoticism dimension), has been carried out in at the least two distinct models. 1 strategy applied these two dimensions to detect psychotic like experiences within the common population (four,SCL90-R is often a well known self report instrument to5, six). In fact, the researchers have utilized either the sum or mean of scores on the two dimensions as the reference score, and named the subjects PubMed ID:http://www.ncbi.nlm.nih.gov/pubmed/21367761 with scores above the 75 to 90 percentiles “positive” for psychotic like experiences and predisposed to psychosis. In other research, the percentage of affirmative answers has been utilized to detect the rate of psychotic buy MIR96-IN-1 symptoms within the common population based on an accepted cut off for the distressfulness of symptoms talked about inside the two dimensions (7, 8, 9). Concerning the uncertain validity in the SCL90-R psychosis symptom dimensions which has been replicated in some studies and has raised the will need for reanalysis (7, ten), it need to be noted that R sler and colleagues , in their twenty- year potential study named “Zurich study”, have also conducted an exploratory element evaluation around the concerns of theseIranian J Psychiatry six:four, FallPublished by “Tehran University of Health-related Sciences” (www.tums.ac.ir)Exploratory Issue Evaluation of SCL90-R Symptoms two dimensions to ascertain classes of psychotic experiences in them (9). Interestingly, they extracted two new dimensions of “schizotypal signs” and “schizophrenia nuclear symptoms “out from the original ones, by altering the order of some concerns and omitting some others by way of their longitudinal sixstep interview evaluation. These newly defined dimensions have also been utilized in some additional research (11, 12). Considering the paucity of explorative studies around the factor structure of those symptoms, we tested this structure inside a general population sample of an Iranians living in an urban region to investigate wh.