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Sex ratios at birth in African populations: A review of survey data
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Abstract This study analyzes the distribution of sex ratio at birth in African populations using data collected in birth histories in sample demographic surveys (Demographic and Health Surveys and World Fertility Surveys). The average sex ratio from 56 surveys, totaling 1.130 million births, was 1.033 (95% CI, 1.029-1.037), significantly different from the world average of 1.055. The distribution of sex ratios across surveys was found to be heterogeneous, and different from what could have been expected from random fluctuations due to sample size. Three subsets were identified: a subset with ...
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Biased childhood sex ratios and the economic status of the family in rural China *.
; ...1991). While a sex ratio at birth falling...Asian countries sex ratios at birth appear...observe a bias in the sex ratios of Chinese children...bias in the primary sex ratio (sex ratio at conception...1991). Secondary sex ratios are more ...
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Sex ratio of common musk turtles (Sternotherus odoratus) in a North-Central Indiana lake: A long-term study
; ...deviations from a 1:1 sex ratio in a population...explanation. Biased sex ratios (male or female...each year's sex ratio differed from...We compared sex ratios between trap...change in the sex ratio, we compared the sex ratios of turtles ...
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Understanding the sex ratio in India: A simulation approach
; ...highly masculine sex ratios at birth, or excess...level of the overall sex ratio; these arguments...highly masculine sex ratios at birth, or excess...underlying the overall sex ratio, are well established...in changes to the sex ratio over time. He ...
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Achieving Women and Declining Sex Ratios
; ...the secondary sex ratio. KEY WORDS: MATERNAL...the secondary sex ratio in developed...world. (Secondary sex ratios were declining...high postwar sex ratios.) The decline...countries, the sex ratio has recently...affecting the sex of ...
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Female feticide in India: Issues and concerns
; ...endorsed by the abnormal sex ratio figures found in the...regarding adverse child sex ratio and its consequences. Sex Ratio and Child Sex Ratio in India Given the...consistently shown an abnormal sex ratio (940 women for every 1000 men). The abnormal ...
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Skewed sex ratio in India
; ...world suggest a sex ratio at birth of about...recognized pressure3. Low sex ratios have also been recorded...an increase in sex ratio has been reported...explanations for unequal sex ratios at birth, including...sharpest decline in sex ratio of the child ...
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Sex ratio at reproductive age: Changes over the last century in the Italian population
; ...increase in the sex ratio at the beginning...recent times the sex ratio in the young...the 1993-1995 sex ratios in different...life. KEY WORDS: SEX RATIO, ITALY It is...conception the sex ratio, referred to as the primary sex ratio, is harder ...
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REVIEW: Sex Wars: Genes, Bacteria, and Biased Sex Ratios.(Book Review)
; ...biological science book on sex ratios. According to the book...explain why different sex ratios exist by introducing the...experimental evidence on sex, sex ratios, sex determination mechanisms...micro-organisms that impact on the sex ratios and evolution ...
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Nuclear Sex-Determining Genes Cause Large Sex-Ratio Variation in the Apple Snail Pomacea canaliculata
; ...maintenance of genetic sex-ratio variation is enigmatic...genes for biased sex ratios are disadvantageous...THE genetics of sex-ratio variation are important...considering the adaptive sex ratios of organisms since...ratios, genes for any sex ratios ...
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Human sex ratio at birth in South West Nigeria
; ...human secondary sex ratio is commonly assumed...birth. However, sex ratios at birth or among...Superscript; noted a sex ratio of 106:100 among...Superscript; reported sex ratios of 107:100 for Ibadan...annual secondary sex ratios of births recorded...1]. ...
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