Secular changes of sex ratio at birth according to birth order in Korea: 1970-1998.

A note on secular changes in the human sex ratio at birth.

Investigations of secular changes in the live-birth sex ratios of different countries have given conflicting results (Gini, 1908; Russell, 1936; Ciocco, 1938; Strandskov, 1942; Martin, 1943). In general the data are unsatisfactory, either because numbers of births are small, or because of inaccuracies and deficiencies in birth notification. Russell (1936) examined statistics for England and Wal...

Sex Ratio at Birth in India, Its Relation to Birth Order, Sex of Previous Children and Use of Indigenous Medicine

OBJECTIVE Sex-ratio at birth in families with previous girls is worse than those with a boy. Our aim was to prospectively study in a large maternal and child unit sex-ratio against previous birth sex and use of traditional medicines for sex selection. MAIN OUTCOME MEASURES Sex-ratio among mothers in families with a previous girl and in those with a previous boy, prevalence of indigenous medic...

Sex ratio at birth in Croatia: update.

There is strong evidence that the sex ratio at birth is partially determined by environmental and social factors. The modern change in those factors serves as an explanation for the secular decline in sex ratio at birth in most of the industrialized countries. This article is the reexamination of the results from my previous communication in which no trend in sex ratio at birth was established ...

Sex ratio at birth and latitude.

Mother's occupation and sex ratio at birth

BACKGROUND Many women are working outside of the home, occupying a multitude of jobs with varying degrees of responsibilities and levels of psychological stress. We investigated whether different job types in women are associated with child sex at birth, with the hypothesis that women in job types, which are categorized as "high psychological stress" jobs, would be more likely to give birth to ...