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Birth Order, Age-Spacing, IQ Differences, and Family Relations

Jane H. Pfouts
Journal of Marriage and Family
Vol. 42, No. 3 (Aug., 1980), pp. 517-531
DOI: 10.2307/351896
Stable URL: http://www.jstor.org/stable/351896
Page Count: 15
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Birth Order, Age-Spacing, IQ Differences, and Family Relations
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Abstract

Recent theoretical advances in the area of birth order and IQ are reviewed and the empirical support for selected aspects of Zajonc and Markus' (1975) confluence model are discussed. To highlight this literature review, data are presented from a study of 37 two-boy families. The data are analyzed to test the age-spacing-IQ assumption of the confluence model and to observe the relative importance of IQ and birth order on comparative sibling academic performance. Results indicate that family socialization shapes first borns' academic overachievement relative to second borns even when second borns are more intellectually gifted.

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