Human live birth and sperm–sex ratios compared
نویسندگان
چکیده
منابع مشابه
Siberian live birth sex ratios and the SPrOO hypothesis.
Melnikov and Grech found a highly significant seasonal pattern of the sex ratio (SR) at birth in western Siberia, namely, a peak in the second and a trough in the fourth quarter of the year. This peak and trough are in line with the seasonal preovulatory overripeness ovopathy (SPrOO) hypothesis, which states (1) an approach to gender equity at the peak of the ‘‘ovulatory’’ seasons, (2) preferen...
متن کاملSiberian live birth sex ratios and the SPrOO hypothesis
Melnikov and Grech found a highly significant seasonal pattern of the sex ratio (SR) at birth in western Siberia, namely, a peak in the second and a trough in the fourth quarter of the year. This peak and trough are in line with the seasonal preovulatory overripeness ovopathy (SPrOO) hypothesis, which states (1) an approach to gender equity at the peak of the ‘‘ovulatory’’ seasons, (2) preferen...
متن کاملSex ratios, family size, and birth order.
In many countries, the male:female ratio at birth has varied significantly over the past century, but the reasons for these changes have been unclear. The authors observed a close parallel between decreasing family size and declining male:female sex ratio in Denmark from 1960 to 1994. To explain this finding, they examined the sex ratio and birth order of 1,403,021 children born to 700,030 coup...
متن کاملBirth of a live fetus in twin pregnancy with hydatidiform mole and co-existent a live fetus: case report
Background: Twin pregnancy consist a healthy fetus, and hydatidium molar pregnancy is unusual and very rare. Its incidence is in about 1,22,000 to 1,100,000 of all pregnancies. This type of pregnancy is commonly associated with several obstetric complications requiring early termination of pregnancy. Managing a twin mole pregnancy with normal and live fetuses is controversial, although this unu...
متن کاملSex ratios at birth after induced abortion.
BACKGROUND Skewed male:female ratios at birth have been observed among certain immigrant groups. Data on abortion practices that might help to explain these findings are lacking. METHODS We examined 1 220 933 births to women with up to 3 consecutive singleton live births between 1993 and 2012 in Ontario. Records of live births, and induced and spontaneous abortions were linked to Canadian imm...
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ژورنال
عنوان ژورنال: Human Reproduction
سال: 1999
ISSN: 1460-2350,0268-1161
DOI: 10.1093/humrep/14.11.2917