A research paper published by Branum et al. According to Nicholas Kristof and Sheryl WuDunn, two Pulitzer Prize-winning reporters for the New York Times, violence against women is causing gender imbalances in many developing countries. Economic factors such as male-majority industries and activities like the petrochemical , agriculture , engineering , military , and technology also have created a male gender imbalance in some areas dependent on one of these industries. On occasion, regions with a high male-low female sex ratio, like Alaska, have shown a correlation with a higher rate of reported rape. The sex ratio in East Germany was also at its lowest in The relationship between natural factors and human sex ratio at birth, and with aging, remains an active area of scientific research. They found no effect on birth sex ratio from Hepatitis B presence in either the mothers or fathers. It has been proposed that these environmental factors also explain sex differences in mortality. For example, in the United States, as of , an adult non-elderly male is 3 to 6 times more likely to become a victim of a homicide and 2.
This effect may be caused by emigration and higher male mortality as result of higher Soviet era deaths; it may also be related to the enormous by western standards rate of alcoholism in the former Soviet states. For example, James suggested  that Ein-Mor results are based on some demographic variables and a small data set, a broader study of variables and larger population set suggests human sex ratio shows substantial variation for various reasons and different trend effects of length of gestation than those reported by Ein-Mor. However, they report a significant effect of paternal age. On occasion, regions with a high male-low female sex ratio, like Alaska, have shown a correlation with a higher rate of reported rape. They also consider the hypothesis that sons are preferred in these countries of the Caucasus, the spread of scans and there being a practice of sex-selective abortion; however, the scientists admit that they do not have definitive proof that sex-selective abortion is actually happening or that there are no natural reasons for the persistently high birth sex ratios. Essentially he argues that the 1: In the case of China, because of deficiencies in the vital statistics registration system, studies of sex ratios at birth have relied either on special fertility surveys, whose accuracy depends on full reporting of births and survival of both male and female infants, or on the national population census from which both birth rates and death rates are calculated from the household's reporting of births and deaths in the 18 months preceding the census. Neither gravidity nor parity seem to affect the male-to-female ratio. In the warmest period over the years, the birth sex ratio peaked at about 1. In economically developed countries, as well as developing countries, these scientific studies have found that the human sex ratio at birth has historically varied between 0. These chemicals are believed to have accumulated in the tissues of fish and animals that make up the bulk of these populations' diets. In a scientific paper published in ,  James states that conventional assumptions have been: There is evidence that this situation will lead to increased levels of antisocial behavior and violence and will ultimately present a threat to the stability and security of society. Countries on the Arabian peninsula tend to have a 'natural' ratio of about 1. When there is a shortage of women in the marriage market, the women can "marry up", inevitably leaving the least desirable men with no marriage prospects. This assumption has been questioned by some scholars. Latitude , with countries near the equator producing more females than near the poles. For example, in the United States, as of , an adult non-elderly male is 3 to 6 times more likely to become a victim of a homicide and 2. Fisher's principle Fisher's principle is an explanation of why the sex ratio of most species is approximately 1: The population stressors theory predicts that the East German sex ratio should have been lower in when East Germany's economy collapsed than expected from its previous years. The sex ratio in East Germany was also at its lowest in However, during this period, there were also shifts in demographics that influence the sex ratio. For example, Oster et al. It has been proposed that these environmental factors also explain sex differences in mortality. He compared the sex ratio in East and West Germany for the years to , with genetically similar populations. Qatar has the highest male ratio, with 2.
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