Found 2060 Hypotheses across 206 Pages (0.006 seconds)
  1. The sex ratio should be higher in countries where contraception is widely practiced.Barber, Nigel - Sex Ratio at Birth, Polygyny, and Fertility: A Cross-National Study, 2004 - 2 Variables

    This article discusses the variation in sex ratios at birth among human populations and the possible explanations for this variation. One possible explanation is the timing of intercourse and its relationship to the frequency of intercourse, which can affect the timing of conception. The article presents evidence that the male/female sex ratios of 148 countries declined with total fertility rates and polygyny intensity and increased with contraception use in correlational analysis. These results were independent of mother's age and level of economic development. The predictive effect of polygyny and contraception disappeared when total fertility was added to the equation. The article also considers other possible explanations for the variation in sex ratios, such as genetics, hormones, nutrition, and social factors.

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  2. The sex ratio at birth will decline with polygyny.Barber, Nigel - Sex Ratio at Birth, Polygyny, and Fertility: A Cross-National Study, 2004 - 2 Variables

    This article discusses the variation in sex ratios at birth among human populations and the possible explanations for this variation. One possible explanation is the timing of intercourse and its relationship to the frequency of intercourse, which can affect the timing of conception. The article presents evidence that the male/female sex ratios of 148 countries declined with total fertility rates and polygyny intensity and increased with contraception use in correlational analysis. These results were independent of mother's age and level of economic development. The predictive effect of polygyny and contraception disappeared when total fertility was added to the equation. The article also considers other possible explanations for the variation in sex ratios, such as genetics, hormones, nutrition, and social factors.

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  3. "Teen pregnancy will increase as the sex ratio declines" (30).Barber, Nigel - On the relationship between country sex ratios and teen pregnancy rates, 2000 - 2 Variables

    This study attempted to replicate earlier findings regarding population structure and teen pregnancy rates. Findings support the previous predictions that sex ratio, economic development, and latitude are all inversely related to teen birth rates.

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  4. Teen pregnancy will decline as economic development increases (33).Barber, Nigel - On the relationship between country sex ratios and teen pregnancy rates, 2000 - 2 Variables

    This study attempted to replicate earlier findings regarding population structure and teen pregnancy rates. Findings support the previous predictions that sex ratio, economic development, and latitude are all inversely related to teen birth rates.

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  5. "Teen birth rates will be lower at high latitudes" (30).Barber, Nigel - On the relationship between country sex ratios and teen pregnancy rates, 2000 - 2 Variables

    This study attempted to replicate earlier findings regarding population structure and teen pregnancy rates. Findings support the previous predictions that sex ratio, economic development, and latitude are all inversely related to teen birth rates.

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  6. Less contraceptive use will be positively associated with decreases in fertility (294)Ember, Carol R. - The relative decline in women’s contributions to agriculture with intensific..., 1983 - 2 Variables

    This article presents theory and hypothesis tests that suggest that the decline of women's contribution to intensive agriculture is related to increases in fertility and domestic work associated with cereal crops. Additionally, men in agricultural societies are less likely to invest time in hunting and warfare, so their contribution of agricultural labor relative to women's increases.

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  7. Societies with intensive agriculture will have higher fertility than societies with horticulture.Ember, Carol R. - The relative decline in women’s contributions to agriculture with intensific..., 1983 - 2 Variables

    This article presents theory and hypothesis tests that suggest that the decline of women's contribution to intensive agriculture is related to increases in fertility and domestic work associated with cereal crops. Additionally, men in agricultural societies are less likely to invest time in hunting and warfare, so their contribution of agricultural labor relative to women's increases.

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  8. A culturally independent association exists between dependence on agriculture and fertility(879).Sellen, Daniel W. - Fertility and mode of subsistence: a phylogenetic analysis, 1997 - 2 Variables

    This study tests for a relationship between subsistence type and fertility using phylogenetic and statistical analyses. The authors find a clear relationship between dependence on agriculture and fertility among non-permanently settled groups.

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  9. Historic plough use will be positively associated with fertility rate (499).Alesina, Alberto - Fertility and the plough, 2011 - 2 Variables

    The researchers examine Boserup's (1970) theory that variation in traditional agricultural practices shape gender roles by examining the relationship between historical plough use and contemporary fertility rates and preferential attitudes towards fertility. Contrary to expectation, tests show a negative relationship between plough use and both of these variables. The authors theorize that since children are less capable of performing the intensive labor required by plough agriculture compared to hoe agriculture, adoption of the plough deincentivized increased fertility and reduced its value among agriculturalists.

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  10. Male status is positively associated with mating effort, but not with offspring mortality (10825).von Rueden, Christopher R. - Men’s status and reproductive success in 33 nonindustrial societies: Effects..., 2016 - 8 Variables

    The researchers examine associations between male status and various measures of reproductive success among foraging/non-foraging, and monogamous/polygynous societies in order to test the "egalitarian hypothesis" which predicts lower status effects in hunter-gatherer groups. Contrary to this hypothesis, they find that male social status is equally significantly associated with reproductive success in foraging and nonforaging societies. Additional support is found for the "mating effort" hypothesis, which predicts that male reproductive success will be more associated with fertility than offspring mortality in polygynous societies, leading the authors to make various suggestions regarding the evolutionary mechanisms at play.

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