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The suprachiasmatic nucleus is also known to be larger in men than in women. [39] An analysis of the hypothalamus by Swaab and Hofman (1990;2007) found that the volume of the SCN in homosexual men was 1.7 times larger than a reference group of male subjects, and contained 2.1 times as many cells.
According to a study conducted by Whitcome, et al., lumbar lordosis can increase from an angle of 32 degrees at 0% fetal mass (i.e. non-pregnant women or very early in pregnancy) to 50 degrees at 100% fetal mass (very late in pregnancy). Postpartum, the angle of the lordosis declines and can reach the angle prior to pregnancy.
The fraternal birth order effect has been described by one of its proponents as "the most consistent biodemographic correlate of sexual orientation in men". [5] In 1958, it was reported that homosexual men tend to have a greater number of older siblings (i.e., a 'later/higher birth order') than comparable heterosexual men and in 1962, these findings were published in detail. [6]
Vomiting is a common condition affecting about 50% of pregnant women, with another 25% having nausea. [48] However, the incidence of HG is only 0.3–1.5%. [4] After preterm labor, hyperemesis gravidarum is the second most common reason for hospital admission during the first half of pregnancy. [16]
Jonathan Ned Katz dates the definition of heterosexuality, as it is used today, to the late 19th century. [50] According to Katz, in the Victorian era, sex was seen as a means to achieve reproduction, and relations between the sexes were not believed to be overtly sexual. The body was thought of as a tool for procreation – "Human energy ...
Cervical effacement is an important component of the Bishop score and is reported as a percentage. 0% indicates the cervix is at normal length, 50% indicates the cervix is half of the expected length and 100% effaced means the cervix is paper thin. [10] The Bishop score has been modified in current medical practice.
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 ...
A chemical pregnancy is a pregnancy that was detected by testing but ends in miscarriage before or around the time of the next expected period. [64] Chromosomal abnormalities are found in more than half of embryos miscarried in the first 13 weeks.