Birth order, family size, and intelligence
Belmont, L.; Marolla, F.A.
Science 182(4117): 1096-1101
1973
ISSN/ISBN: 0036-8075 PMID: 4750607 DOI: 10.1126/science.182.4117.1096Document Number: 513714
The relation of birth order and family size to intellectual performance, as measured by the Raven Progressive Matrices, was examined among nearly all of 400,000 19-year-old males born in the Netherlands in 1944 through 1947. It was found that birth order and family size had independent effects on intellectual performance. Effects of family size were not present in all social classes, but effects of birth order were consistent across social class.