BACKGROUND Psychology of an individual varies due to internal and external factors. It has been proven that certain types of cancers are more prevalent among particular type of blood groups. Studies are carried out in different parts of the world to find out if relationship exists between blood groups and different behavioural patterns among humans. The objective of this study is to find out whether the behavioural pattern differs among different blood groups. MATERIALS AND METHODS A standard Eysenck's questionnaire was used for this study. This questionnaire facilitates in identifying the liars and to exclude them from the study. About 500 samples were collected from medical students and their blood group details were obtained and recorded. All the data was analysed and interpreted. RESULTS The introvert behaviour was almost same in A, B and O blood groups. The introvert behaviour in AB blood group differs significantly from that of A, B and O blood groups. The extrovert behaviour within AB and O differ significantly, [p= 0.015]. Likewise, the Neuroticism between AB to A and B blood groups significantly varied [p CONCLUSION When the extrovert and average behaviour of all the four blood groups were analysed, this behaviour was not found to be statistically significant in all blood groups. Besides the introvert behaviour was found to be statistically significant, the neuroticism behaviour was analysed among blood groups, the difference was found to be statistically significant. KEY WORDS Eysenck's Questionnaire, Lie Score, Introvert, Extrovert, Neuroticism.
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