The responses to the High School Personality Questionnaire and the Millon Adolescent Personality Inventory of a series of neonatally identified 47,XXY adolescent males and age‐matched controls were compared. The extra X males' results indicated that they were more assertive, impulsive and prone to conflict than controls. Individual differences in these characteristics among the extra X cases had little relationship to quality of parenting but were related to indices of pubertal development.
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