The study used the HEXACO Personality Inventory to assess 6 personality traits based on sibling birth order: honesty-humility, emotionality, extraversion, agreeableness, conscientiousness, and ...
Using the HEXACO Personality Inventory, the study found that middle children score highest in traits such as honesty, humility, and agreeableness. This challenges stereotypes about birth order ...
That said, he noted that the findings may relate more to family size than birth order, since middle children tend to be ... be higher in these co-operative traits. "We suspect that when one ...