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Birth Order Effects on Personality and Achievement within Families

Delroy L. Paulhus, Paul D. Trapnell and David Chen
Psychological Science
Vol. 10, No. 6 (Nov., 1999), pp. 482-488
Stable URL: http://www.jstor.org/stable/40063474
Page Count: 7
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Birth Order Effects on Personality and Achievement within Families
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Abstract

We investigated birth order effects on personality and achievement in four studies (N = 1,022 families) including both student and adult samples. Control over a wide range of variables was effected by collecting within-family data: Participants compared their siblings (and themselves) on a variety of personality and achievement dimensions. Across four diverse data sets, first-borns were nominated as most achieving and most conscientious. Later-borns were nominated as most rebellious, liberal, and agreeable. The same results obtained whether or not birth order was made salient (to activate stereotypes) during the personality ratings. Overall, the results support predictions from Sulloway's niche model of personality development, as well as Zajonc's confluence model of intellectual achievement.

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