Dama Madhukar Shivajirao
S/O: Shivajirao Dama, Atpost: Rajeshwar, Tq: Basavakalyan, Dist, Bidar, Karnataka, India, 585331.
Naturwissenschaften. 2013 Jun;100(6):559-69. doi: 10.1007/s00114-013-1052-3. Epub 2013 May 9.
Human populations show remarkable variation in the sex ratio at birth which is believed to be related to the parental condition. In the present study, the global variation of sex ratio at birth (SRB, proportion of male offspring born) was analyzed with respect to indirect measure of condition, the intelligence quotient (IQ). IQ correlates strongly with lifespan across nations, which makes it a good indicator of health of the large populations. Relation between three standard measures of average national IQ and SRB was studied using multiple linear regression models. Average national IQ was positively correlated with SRB (r = 0.54 to 0.57, p < 0.001). Further, IQ emerged as a powerful predictor of SRB after controlling for the effects of all the known covariates like fertility, maternal age, polygyny prevalence, wealth, son preference, latitude, low birth weight, and neonatal mortality in the regression models. These results suggest that the striking variation of offspring sex ratio across nations could be caused in part by the difference in general condition of populations.
人类出生时的性别比例存在显著差异，这被认为与父母的状况有关。在本研究中，我们根据间接的状况衡量指标——智商（IQ），分析了全球出生时性别比例（SRB，即出生男婴的比例）的变化情况。各国的智商与寿命密切相关，这使其成为大量人群健康状况的良好指标。我们使用多元线性回归模型研究了国家平均智商的三个标准衡量指标与SRB之间的关系。国家平均智商与SRB呈正相关（r = 0.54至0.57，p < 0.001）。此外，在回归模型中控制了所有已知协变量（如生育率、产妇年龄、一夫多妻制流行率、财富、重男轻女观念、纬度、低出生体重和新生儿死亡率）的影响后，智商成为SRB的有力预测指标。这些结果表明，各国后代性别比例的显著差异可能部分是由人群总体状况的差异造成的。
