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

L Belmont; Z Stein; P Zybert

doi:10.1126/science.568823

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

Science. 1978 Dec 1;202(4371):995-6. doi: 10.1126/science.568823.

Authors

L Belmont, Z Stein, P Zybert

PMID: 568823
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.

Publication types

Research Support, U.S. Gov't, P.H.S.

MeSH terms

Birth Order*
Family
Female
Humans
Intelligence*
Male
Maternal Age
Socioeconomic Factors
Time Factors