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Pregnancy rates did not change notably between the 27–29 age group and the 30–34 age group, but dropped significantly for the 35–39 age group. [14] The age of the male partner had a significant impact on female fertility among the women who had reached their mid-30s, but not among the younger women.
The mean age at childbearing indicates the age of a woman at their childbearing events, if women were subject throughout their lives to the age-specific fertility rates observed in that given year. [1] In countries with very high fertility rates women can have their first child at a much younger age than the mean age at childbearing.
Pregnancy rates are 140 per 1000 women of childbearing age in the developing world and 94 per 1000 in the developed world. [11] The rate of pregnancy, as well as the ages at which it occurs, differ by country and region.
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 .
While the government agency didn't share numbers beyond age 44, the data show that fertility rates rapidly increased in women in the 40 to 44 age group. In 1990, the fertility rate in this group ...
The replacement fertility rate is 2.1 births per female for most developed countries (in the United Kingdom, for example), but can be as high as 3.5 in undeveloped countries because of higher mortality rates, especially child mortality. [11]
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Studies in 2008 and 2013 indicated that Asians (23 per 1,000) and whites (43 per 1,000) have lower rates of pregnancy before the age of 20. [15] [18] Teen birth rates decline by racial groups [8] Teen birth rates declined from 2018 to 2019 for several racial groups and for Hispanics.Among 15- to 19-year-olds, teen birth rates decreased:
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