birth order, family size, neurosis

birth order and family size in schizophrenia

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Intelligence, birth order, and family size.

The analysis of the National Child Development Study in the United Kingdom (n = 17,419) replicates some earlier findings and shows that genuine within-family data are not necessary to make the apparent birth-order effect on intelligence disappear. Birth order is not associated with intelligence in between-family data once the number of siblings is statistically controlled. The analyses support ...

Childhood allergies, birth order and family size.

Sex ratios, family size, and birth order.

In many countries, the male:female ratio at birth has varied significantly over the past century, but the reasons for these changes have been unclear. The authors observed a close parallel between decreasing family size and declining male:female sex ratio in Denmark from 1960 to 1994. To explain this finding, they examined the sex ratio and birth order of 1,403,021 children born to 700,030 coup...

Birth Order, Family Size and Educational Attainment

This paper investigates the e ect of family size and birth order on educational attainment. An instrumental variables approach is used to identify the e ect of family size. Instruments for the number of children are twins at last birth and the sex mix of the rst two children. The e ect of birth order is identi ed, by examining the relation with years of education for di erent family sizes separ...

Incidence of neurosis related to maternal age and birth order.

Order of birth and the strongly associated variable maternal age have often been investigated as possible determinants of a variety of congenital abnormalities. The work of Penrose (1934) and Malzberg (1950) on mongolism, and that of Still (1927) and McKeown, MacMahon, and Record (1951) on congenital pyloric stenosis has pointed to some of the difficulties. Birth order has also frequently been ...