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Related Experiment Videos

Birth order and personality.

David Lester1, Ahmed Abdel-Khalek

  • 1Psychology Program, The Richard Stockton College of New Jersey, Jimmie Leeds Road, Pomona, NJ 08240-0195, USA.

Perceptual and Motor Skills
|August 3, 2005
PubMed
Summary
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Birth order did not significantly impact personality traits in American undergraduates. This study found no differences in personality test scores based on birth position within 2-child or 3-child families.

Area of Science:

  • Psychology
  • Behavioral Science
  • Social Psychology

Background:

  • The influence of birth order on personality development is a long-standing topic in psychological research.
  • Previous studies have yielded mixed results regarding the impact of birth order on various psychological outcomes.
  • Understanding these influences is crucial for developmental psychology and individual differences research.

Purpose of the Study:

  • To investigate the relationship between birth order and personality traits in a contemporary American undergraduate sample.
  • To determine if birth order has a discernible effect on personality test scores within specific family structures (2-child and 3-child families).

Main Methods:

  • A sample of 273 American undergraduates completed a battery of standardized personality tests.

Related Experiment Videos

  • Statistical analyses were performed to compare personality scores across different birth orders (e.g., firstborn, middle child, lastborn) within 2-child and 3-child families.

    • Main Results:

    • No statistically significant differences were found in personality test scores when comparing individuals based on their birth order.
    • This finding held true for participants from both 2-child and 3-child family structures.

    Conclusions:

    • Birth order does not appear to be a significant determinant of personality traits in the studied population of American undergraduates.
    • The results suggest that other factors may play a more substantial role in shaping personality than birth position within these family sizes.