Personality, blood type, and the five-factor model

Equivocal results continue to beset investigations into the relation between blood type and personality. When results are significant, there is little consensus as to the personality characteristics of members of any one blood type. The present study evaluated seven hypotheses (as taken from previous research), using the conceptualization of personality based on the Five-Factor Model. Over 400 Canadian university students indicated their sex and blood type, and then completed the NEO Personality Inventory (NEO-PI), consisting of five subscales: Extraversion, Agreeableness, Conscientiousness, Neuroticism, and Openness to Experience. Results showed males had lower Agreeableness and Neuroticism scores than females; however, there was neither a main effect for blood type, nor a sex by blood type interaction.