Background: Addiction is one of the most prominent problems and the fourth leading crisis worldwide. In Iran, this issue is more complicated because of increasing young population in this country. Objectives: This study aimed to predict addiction susceptibility regarding students’ personality traits at Qazvin universities. Methods: In this cross-sectional study, 227 students from Qazvin universities were selected using the multistage random stratifi ed sampling method. Data collection tools were demographic information form, Addiction Susceptibility questionnaire (ASQ), and NEO personality inventory. After collecting the required data, SPSS software version 21 was used to analyze the data by running variance analysis and paired sample t-test. Results: In this study, neuroticism (P = 0. 031) and openness (P = 0. 043) with regression coeffi cients of 0. 584 and 0. 586 had positive and signifi cant eff ects on addiction susceptibility, respectively. In contrast, extraversion (P = 0. 023), agreeableness (P = 0. 038), and consciousness (P < 0. 001) with regression coeffi cients of-0. 639,-0. 186, and-1. 342 had negative and signifi cant eff ects on addiction susceptibility, respectively. Conclusions: The fi ndings revealed a signifi cant relationship between personality traits and addiction susceptibility. Accordingly, the aforementioned psychological traits must be empathized in educational, preventive, and therapeutic programs so that the vulnerable groups, including students, would receive some help.

The Big Five Inventory (BFI) is one of the most widely used personality questionnaires, but very few studies have been conducted on its psychometric properties in Iranian population. This study was carried out with the aim of studying the psychometric properties of the BFI questionnaire. For this purpose, 390 university students in Tehran (210 girls and 180 boys) with an age range of 18 to 56 years (M = 27.52; SD = 8.79) were selected using the convenience sampling method and completed BFI and NEO-FFI questionnaires. Cronbach's alpha, multitrait-multimethod matrix, and confirmatory factor analysis were used to estimate the psychometric properties of the questionnaire. The result of the confirmatory factor analysis showed that 15 of the 44 items did not have a strong factor loading (higher than 0.40) on the corresponding factors and were therefore removed from the questionnaire. The fit indices showed that the Persian version of 29 questions (BFI-29) with 5 factors has a good fit with the data. The reliability analysis also showed that the range of Cronbach's alpha coefficients of the factors is from 0.70 to 0.79. The lowest Cronbach's alpha coefficient was related to agreeableness factor and the highest was related to conscientiousness. The findings from the multitrait-multimethod matrix showed that the BFI-29 questionnaire has good convergent and divergent validity with the NEO-FFI questionnaire. In general, based on the results of the present study, it can be said that the BFI-29 questionnaire has desirable psychometric properties and whenever a short tool for personality measurement is needed, this questionnaire can be used.

Objective: Suicide is a major public health problem with little information about the role of personality characteristics of people who chemically commit suicide. The present study aimed to investigate the role of personality traits in the chemical suicide attempters.Methods: In a case-control study, 100 patients with attempted suicide selected by convenience sampling were compared to 100 normal subjects as a control group selected by consecutive sampling in terms of personality traits using short form 5-factor questionnaire of NEO.Results: Suicide attempters got significantly higher scores in neuroticism and also lower scores in extroversion, openness, agreeableness, and conscientiousness (P<0.01) compared to normal individuals. Interaction effects of group membership by sex revealed that male suicide attempters had always higher neuroticism levels and lower extraversion and openness (P<0.05) compared to the other sex group.Conclusion: The findings accurately identified the basic personality dimensions influencing the antisocial phenomenon and provided approaches for prevention and treatment of suicide attempters.

In order to predict academic achievement on the basis of personality traits, 200 junior high school students (100 female, 100 male), chosen by multistage sampling method, completed the Five Factor Personality Inventory (NEO-FFI); (Costa & McCare, 1992). Their academic achievement was assessed through national high school entrance exam scores. Academic achievement had a positive correlation with extraversion, agreeableness, and conscientiousness, a negative correlation with neuroticism, and no correlation with openness to experience. Stepwise regression analysis showed that only neuroticism and con- scientiousness, in two steps, could explain 9% of variance in academic achievement. The results are discussed in terms of the trait theory of personality.

The purpose of this study was to predict academic procrastination based on the five main factors of personality and self-handicapping and their components. The research method was correlational. The statistical population of the study included all the Qom University female students in all the fields within the academic year 2018-2019. The 351 samples were selected by stratified sampling method appropriate to the size of the faculty and based on the Morgan Table. The relevant questionnaires for academic procrastination, NEO personality traits inventory, and self-handicapping questionnaire were used to collect data. Using SPSS software, the obtained data were analyzed at two levels: descriptive level (mean, standard deviation and variance) and inferential level (correlation coefficient, and regression analysis). Findings showed that academic procrastination has a direct and significant relationship with self-handicapping and neuroticism and extraversion. Also, academic procrastination has an inverse and significant relationship with conscientiousness. In addition, academic procrastination is inversely related to agreement and openness to experience. The findings also suggested that negative mood, effortfulness, apology, neuroticism, extraversion, and conscientiousness can predict academic procrastination. Overall, it can be concluded that self-handicapping and personality traits can predict academic procrastination.