Data from these states were excluded from analysis for the corresponding years. Thus, potential increases in low-level exposure to hormonally-active compounds have been postulated to underlie the recent US sex ratio trends in some analyses Davis et al. If no interaction was present, overall trends in male birth proportion were adjusted for the covariate of interest along with maternal age.
It is usually measured as the number of males per females. To examine the influence of increasing numbers of births to mothers with Hispanic ethnicity on trends, less data were available —
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Among top 20 countries having greater proportion of females, 16 belongs to Europe and North America continent. Now, the sex ratio at birth in China has been reduced to Shortly after these facts became known, it became illegal for expectant couples to know the gender of their fetus.
Matt Rosenberg is a professional geographer and writer with over 20 years of experience. For analyses by plurality, data were categorized as singleton or multiple twins and higher births.