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If replacement level fertility is sustained over a sufficiently long period, each generation will exactly replace itself. [8] 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 ...
The average age of a girl's first period is 12 to 13 (12.5 years in the United States, [6] 12.72 in Canada, [7] 12.9 in the UK [8]) but, in postmenarchal girls, about 80% of the cycles are anovulatory in the first year after menarche, which declines to 50% in the third year, and to 10% by the sixth. [9]
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.
"Women in their mid- to late 40s who become pregnant are at higher risk for complications in pregnancy, such as hypertension, gestational diabetes, poor fetal growth and operative delivery," Dr ...
In the US, the average age at which women bore their first child advanced from 21.4 years old in 1970 [11] to 26.9 in 2018. [4]The German Federal Institute for Population Research claimed in 2015 the percentage for women with an age of at least 35 giving birth to a child was 25.9%.
By the first partition in 1772, the Polish–Lithuanian Commonwealth lost about 211,000 square kilometres (81,000 sq mi) (30% of its territory, amounting at that time to about 733,000 square kilometres (283,000 sq mi)), with a population of over four to five million people (about a third of its population of 14 million before the partition).
About 95 out of 100 couples who are trying to get pregnant do so within two years. [90] Women become less fertile as they get older. For women aged 35, about 94% who have regular unprotected sexual intercourse get pregnant after three years of trying. For women aged 38, however, only about 77%. The effect of age upon men's fertility is less ...
From Our World in Data (using World Health Organization definition): "The maternal mortality ratio (MMR) is defined as the number of maternal deaths during a given time period per 100,000 live births during the same time period. It depicts the risk of maternal death relative to the number of live births and essentially captures the risk of ...