Reports

Child spacing and birth order: effect on intellectual ability in two-child families

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Science  01 Dec 1978:
Vol. 202, Issue 4371, pp. 995-996
DOI: 10.1126/science.568823

Abstract

The effect on intellectual ability of the spacing of the birth of siblings was studied in two series of young men from two-child families: (i) 535 pairs of brothers and (ii) 1511 unrelated firstborn and secondborn. Birth-order effect and level of ability were not influenced by length of interval between firstborn and secondborn.

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