Women's age at menarche and offspring sex ratio
نویسندگان
چکیده
منابع مشابه
The Association Between Menarche Age and First Offspring Sex Ratio
Background: Offspring sex ratio (OSR) serves as an important social factor, and various other factors are hypothesized to be associated with it, such as maternal diet, time of ovulation and insemination, environmental phenomena, parental age, and infertility treatment. Objectives: This research was performed to assess the association between mothers’ menarche age, first pregnancy age, and sex r...
متن کاملNo association between age at menarche and sex of offspring.
Sir, We read with interest the article by Fukuda et al. (2011). The title ‘The sex ratio of offspring is associated with the mothers’ age at menarche’ suggests a direct connection between age at menarche and sex of offspring. We consider this interpretation a stretch of the presented data and want to comment on some issues in their study. Additionally, results from our substantially larger Dani...
متن کاملIonizing radiation and offspring sex ratio.
tends to have a predictable effect on smoking cessation. However, from a social perspective, it is fairly certain (to within relatively narrow confidence limits) how many cases of lung cancer or cardiac events will be avoided if 10000 persons stop smoking. What this illustrates is that social benefit is more certain than individual benefit. In other words, if we are concerned with a social pers...
متن کامل2nd to 4th digit ratio and offspring sex ratio.
There is evidence that the ratio of the length of the 2nd and 4th digit (2D:4D) is negatively related to prenatal and adult concentrations of testosterone. It has also been reported that high levels of testosterone at conception in both fathers and mothers are associated with an increased sex ratio (proportion of males at birth). It follows from these observations that low values of 2D:4D may b...
متن کاملSize at birth predicts age at menarche.
OBJECTIVE This study examines the relationship of intrauterine growth, measured by size and maturity at birth, to age at menarche, while also considering a wide range of other factors that may affect maturation. The research is motivated by the current debate about the importance of the prenatal environment as a determinant of later disease risk. METHODS Data were collected during the Cebu Lo...
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ژورنال
عنوان ژورنال: Human Reproduction
سال: 2011
ISSN: 0268-1161,1460-2350
DOI: 10.1093/humrep/der204