Download or read book Pre-transitional Populations: Natural Fertility written by Christine Langhoff and published by GRIN Verlag. This book was released on 2007-08 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: Essay from the year 2002 in the subject Geography / Earth Science - Physical Geography, Geomorphology, Environmental Studies, grade: 1.1 (A), Oxford University (New College), 6 entries in the bibliography, language: English, abstract: Fertility is directly determined by so-called intermediate fertility variables or proximate determinants which are, in turn, affected by indirect determinants such as socio-economic, cultural and environmental variables. Many different proximate determinants influence fertility and the relationship between them and the level of fertility can be analysed using a comprehensive model. The result of this analysis shows that variations in four factors - marriage, contraception, lactation and induced abortion - are the primary proximate causes of fertility differences among populations. While fertility variations can always be traced to variations in one or more of the intermediate variables, the scope for variation differs among the variables as does their degree of influence in different societies and over time within societies.