منابع مشابه
Brith Sex Ratio and Pregnancy Outcomes after Bam Earthquake
Background and Objectives: Brith sex ratio could be affected by several factors such as stress due to natural disasters like earthquake. This study was performed to determine the sex ratio and the perinatal outcomes after Bam earthquake. Materials and Methods: This case-control study was designed in two sections for the evaluation of earthquake effects on brith sex ratio and the perinatal outc...
متن کاملGonadotrophin and the human secondary sex ratio.
A review of published reports showed that the sex ratio (proportion of boys) was low among infants conceived after ovulation had been induced. The difference between the observed sex ratio and an expected one of 0 . 514 was highly significant. These findings suggest that maternal gonadotrophin concentrations at the time of conception directly affect the sex of the zygote.
متن کاملSex ratio and time to pregnancy: analysis of four large European population surveys.
OBJECTIVE To test whether the secondary sex ratio (proportion of male births) is associated with time to pregnancy, a marker of fertility. Design Analysis of four large population surveys. Setting Denmark and the United Kingdom. Participants 49 506 pregnancies. MAIN OUTCOME MEASURE Secondary sex ratio. RESULTS No association was found between the sex ratio and time to pregnancy and no disce...
متن کاملSecondary Sex Ratio among Women Exposed to Diethylstilbestrol in Utero
BACKGROUND Diethylstilbestrol (DES), a synthetic estrogen widely prescribed to pregnant women during the mid-1900s, is a potent endocrine disruptor. Previous studies have suggested an association between endocrine-disrupting compounds and secondary sex ratio. METHODS Data were provided by women participating in the National Cancer Institute (NCI) DES Combined Cohort Study. We used generalized...
متن کاملP-53: Maternal Diet, Vaginal pH and Time of Ovulation Effects on Offspring`s Sex Ratio
Background Although there are different ways to achieve the desired sex of the fetus, most of those are not completely effective. This paper reports a study on human to check the theories which hypothesize that high potassium maternal diet, douching with alkaline substance to change vaginal PH and intercourse around ovulation affects the sex ratio of the progeny MaterialsAndMethods A quasi-expe...
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ژورنال
عنوان ژورنال: American Journal of Epidemiology
سال: 2006
ISSN: 1476-6256,0002-9262
DOI: 10.1093/aje/163.suppl_11.s75-d