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English: United States teen pregnancy rate 15 to 19 year olds (per 1,000), including black, hispanic, and white populations. Data from Table 7. Published report is at U.S. Teenage Pregnancies, Births and Abortions, 2011: National Trends by Age, Race and Ethnicity .
According to a study done on a sample of 782 healthy European couples ages 19–39, fertility starts declining after age 27 and drops at a somewhat greater rate after age 35. Statistical analysis showed that the women in the 27–29 age group had significantly less chance on average of becoming pregnant than did the 19- to 26-year-olds.
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:
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 ...
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In studies that controlled for female partner's age, comparisons between men under 30 and men over 50 found relative decreases in pregnancy rates between 23% and 38%. [43] Sperm count declines with age, with men aged 50–80 years producing sperm at an average rate of 75% compared with men aged 20–50 years and larger differences exist in the ...
New guidelines set by the American College of Obstetricians and Gynecologists emphasize that pregnancy risks should be characterized in five-year age groups—like ages 35–40, 40–44, et cetera ...
Replacement fertility is the total fertility rate at which women give birth to enough babies to sustain population levels, assuming that mortality rates remain constant and net migration is zero. [8] If replacement level fertility is sustained over a sufficiently long period, each generation will exactly replace itself. [ 8 ]