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The low birth rates in the contemporary United States can possibly be ascribed to the recession, which led families to postpone having children and fewer immigrants coming to the US. The current US birth rates are not high enough to maintain the size of the U.S. population, according to The Economist. [69] [70]
Live birth rate is the percentage of all cycles that lead to live birth, and is the pregnancy rate adjusted for miscarriages and stillbirths. For instance, in 2007, Canadian clinics reported a live birth rate of 27% with in vitro fertilisation. [5]
Along with mortality rate, natality rate is used to calculate the dynamics of a population. They are the key factors in determining whether a population is increasing, decreasing or staying the same in size. Natality is the greatest influence on a population's increase. Natality is shown as a crude birth rate or specific birth rate.
Experts weigh in on a new CDC report showing that the U.S. birth rate is alarmingly low.
The U.S. birth rate has been steadily declining for years, but fairly recently it has tipped over into an alarming category. The estimated “replacement fertility rate,” or the number of births ...
These models can give rise to interesting cyclical or seemingly chaotic patterns in abundance over time when fertility rates are high. The terms F i and S i can be constants or they can be functions of environment, such as habitat or population size. Randomness can also be incorporated into the environmental component.
For the first time in nearly a decade, the birth rate among U.S. women is on the rise. According to a Department of Health and Human Services study, the birth rate among women 15 to 44 increased ...
Crude birth rate (CBR) - the number of live births in a given year per 1,000 people alive at the middle of that year. One disadvantage of this indicator is that it is influenced by the age structure of the population. General fertility rate (GFR) - the number of births in a year divided by the number of women aged 15–44, times 1000. It ...