the relationship between students’ personality traits and their blood types

background: the abo blood types are thought to affect the roots of human behavior and act as a predictor of individuals’ personality. the present study aimed to evaluate the relationship between personality factors and the abo blood group. methods: this cross-sectional study used quota, convenience sampling to select 160 students from shahid beheshti university of medical sciences (tehran, iran). the neuroticism, extraversion, openness five-factor inventory (neo-ffi) was used to determine the subjects’ personality traits. blood type of the participants was confirmed based on official documents. the collected data was analyzed using chi-square test in spss 16 . results: there were no significant differences in the prevalence of personality traits between different blood types or the two genders. conclusion: according to the controversial and inconsistent results from different sources, abo blood types do not seem to have significant associations with personality traits.