Cramer J S, Lumey L H
University of Amsterdam, Department of Quantitative Economics, Roetersstraat 11, 1018 WB Amsterdam, the Netherlands.
Hum Biol. 2010 Feb;82(1):103-7. doi: 10.3378/027.082.0106.
Temporal variations in the sex ratio, or the ratio of boys to girls at birth, have been widely studied and variously attributed to social changes, conditions of war, and environmental changes. Recently, Mathews et al. ["You are what your mother eats: Evidence for maternal preconception diet influencing fetal sex in humans," Proc. R. Soc. bond. B 275:1661-1668 (2008)] studied the direct evidence of individual pregnancies and established an association between the sex at birth and the mother's preconception diet. We examined the hypothesis using new evidence from the wartime famine in Holland in 1944-1945 and failed to show an association between maternal diet in pregnancy and the sex ratio. This makes a causal link highly improbable.
出生时的性别比，即出生男婴与女婴的比例，其随时间的变化已得到广泛研究，并被归因于社会变革、战争状况和环境变化等多种因素。最近，马修斯等人[《你吃什么，你就是什么：母亲孕前饮食影响人类胎儿性别的证据》，《英国皇家学会学报B》275:1661 - 1668(2008年)]研究了个体怀孕的直接证据，并确定了出生性别与母亲孕前饮食之间的关联。我们利用1944 - 1945年荷兰战时饥荒的新证据对这一假设进行了检验，结果未能表明孕期母亲饮食与性别比之间存在关联。这使得因果关系极不可能成立。
