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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 average age of a girl's first period is 12–13 (12.5 years in the United States, [4] 12.72 in Canada, [5] 12.9 in the UK [6]), but, in postmenarchal girls, about 80% of the cycles are anovulatory in the first year after menarche, 50% in the third and 10% in the sixth year. [7] A woman's fertility peaks in the early and mid 20s, after which ...
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 ...
A woman in her 20s has an 85% chance of conceiving within one year; by the age of 35, that chance has declined to 66%, and by 40 to 44%. These changes are due to the effects of aging on the ...
General fertility rate (GFR) - the number of births in a year divided by the number of women aged 15–44, times 1000. It focuses on the potential mothers only, and takes the age distribution into account. Child-Woman Ratio (CWR) - the ratio of the number of children under 5 to the number of women 15–49, times 1000. It is especially useful in ...
For women, their years of peak fertility overlap with the time they hit their physical peak. Male athletes are also not immune to fertility issues. Burning more energy than you have coming in may ...
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