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  2. Age and female fertility - Wikipedia

    en.wikipedia.org/wiki/Age_and_female_fertility

    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]

  3. Fertility - Wikipedia

    en.wikipedia.org/wiki/Fertility

    The average age of menarche in the United States is about 12.5 years. [34] In postmenarchal girls, about 80% of the cycles are anovulatory (ovulation does not actually take place) in the first year after menarche, 50% in the third and 10% in the sixth year. [35] Menopause occurs during a woman's midlife between ages 48 and 55.

  4. Pregnancy rate - Wikipedia

    en.wikipedia.org/wiki/Pregnancy_rate

    As an example, one center in the United States reported an implantation rate in IVF of 37% at a maternal age of less than 35 years, 30% at 35 to 37 years, 22% at 38 to 40 years, and 12% at 41 to 42 years. [3] Successful implantation of the zygote into the uterus is most likely 8 to 10 days after conception. If the zygote has not implanted by ...

  5. Is it a boy or girl? 24 old wives' tales about predicting a ...

    www.aol.com/news/boy-girl-24-old-wives-214126391...

    If you’ve got that sought-after glow, people may predict you’re having a boy. 12 old wives’ tales about having a girl: You had morning sickness early in pregnancy.

  6. Advanced maternal age - Wikipedia

    en.wikipedia.org/wiki/Advanced_maternal_age

    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%.

  7. Human fertilization - Wikipedia

    en.wikipedia.org/wiki/Human_fertilization

    There is also considerable variability in this interval, with a 95% prediction interval of the ovulation of 9 to 20 days after menstruation even for an average woman who has a mean LMP-to-ovulation time of 14.6. [32] In a reference group representing all women, the 95% prediction interval of the LMP-to-ovulation is 8.2 to 20.5 days. [31]

  8. Timeline of human prenatal development - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_human_prenatal...

    Gestational age: 5 weeks and 0 days until 5 weeks and 6 days old. 36–42 days from last menstruation. Embryonic age: Week nr 4. 3 weeks old. 22–28 days from fertilization. The embryo measures 4 mm (1 ⁄ 8 in) in length and begins to curve into a C shape. The heart bulges, further develops, and begins to beat in a regular rhythm.

  9. Gravidity and parity - Wikipedia

    en.wikipedia.org/wiki/Gravidity_and_parity

    For example, a pregnant female who carried one pregnancy to term with a surviving infant; carried one pregnancy to 35 weeks with surviving twins; carried one pregnancy to 9 weeks as an ectopic (tubal) pregnancy; and has three living children would have a TPAL annotation of T1, P1, A1, L3. This could also be written as 1-1-1-3.

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