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Pregnancy rates and birth rates
Population Studies, 1962Summary In this article the relationships between pregnancy rates per hundred woman-years of exposure and annual birth rates per thousand population are analyzed by means of a simple population model The assumptions underlying this model are: a rate of 80 pregnancies per hundred woman-years of non-contraceptive exposure, a foetal mortality rate of 20 ...
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Interrelations between death rates and birth rates
Theoretical Population Biology, 1972Theories of fertility including macrolevel theories microeconomic theories and the more recent structural and community-level approaches are described and compared. A theory consists of a series of statements about the relationship between clearly defined variables. Fertility theories seek to describe the major influences affecting fertility.
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Colorectal cancer statistics, 2020
Ca-A Cancer Journal for Clinicians, 2020Rebecca L Siegel +2 more
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