RE: "SEX RATIOS, FAMILY SIZE, AND BIRTH ORDER"

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, neurosis

in an attempt to investigate the relationship of birth rank and family size with the incidence of neurosis in an iranian culture, case notes of 1029 schizophrenic patients as (497 males and 532 females) referred to psychiatric clinic for insured workers were studied. the incidence of neurasis appeared to be significantly more frequent among the first-half position of birth  rders in the familie...

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.