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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 oflQ and birth order on comparative sibling academic perfbrmance. Results indicate that
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Jane H. Pfouts (1980) studied this question.
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