Conventional theories have little to say about the level at which fertility will stabilize at the end of the demographic transition, although it is often assumed that replacement fertility of about 2.1 births per woman will prevail in the long run. However, fertility has dropped below the replacement level in virtually every population that has moved through the transition. If future fertility ...

OLICINOGENIC factors (col factors) are transferred among different Hfr cor F+ and Fstrains of Escherichia coli K-12 as extrachromosomal particles (FREDERICQ and BETZ-BAREAU 1953; NAGEL DE ZWAIG, A N T ~ N , and PUIG 1962; CLOWES 1963). While some factors, like colE, and colE,, do not affect the fertility of donor strains, others, for example colB or colI, have been reported either to cause fert...

This paper aims at explaining medium-term fertility variations in twentieth century Sweden by relating the total fertility rate to macro-level economic change and gender-specific changes in economic factors relevant to women’s childbearing behaviour. Economic theory is combined with a structural analytical approach in the multivariate time series analysis of the determinants of fertility. A mod...

Although a high proportion of marriages in Asia are consanguineous (i.e. contracted between close biological relatives), with some notable exceptions, there is a death of demographic and anthropological literature on the association between consanguinity and fertility. This paper presents an overview of the prevalence of consanguineous marriages in selected South and Southeast Asian countries, ...

HEALTH ISSUE: Total fertility rates (TFRs) have decreased worldwide. The Canadian fertility rate has gone from 3.90 per woman in 1960 to 1.49 in 2000. However, not many studies have examined the impact on women's health of reduced fertility rates, delayed fertility and more births to unmarried women. This paper presents information on the relation between family size and specific determinants o...