Gray E
J Hered. 1982 Mar-Apr;73(2):123-7. doi: 10.1093/oxfordjournals.jhered.a109594.
Transgeneration analyses, involving the parental, present, and projected generations, were made of the human sex ratio and the influence of combinations and permutations of sexes of children on family size in a population of Western Kentucky University students and their families. The investigation included some previously studied characteristics of the population. The general conformity of the results, previous and present, suggests a high degree of repeatability within the findings. Secondary sex ratios (males: 100 females) were 106.4, 101.2, and 133.3, respectively, for the parental, present, and projected generations. Corresponding average family sizes were 4.73, 3.70, and 2.80 children. A higher percentage of one-child families included both sexes with the male being first-born, and more two-child families consisted of two males rather than two females. The two-child (male-female order) family occurred more frequently than any other family regardless of size, combination, or permutation of sexes.
对西肯塔基大学学生及其家庭群体进行了跨代分析，涉及亲代、当代和预期代，内容包括人类性别比例以及子女性别组合和排列对家庭规模的影响。该调查涵盖了该群体一些先前已研究过的特征。此前和当前结果的总体一致性表明研究结果具有高度可重复性。亲代、当代和预期代的次生性别比（男性∶100女性）分别为106.4、101.2和133.3。相应的平均家庭规模分别为4.73个孩子、3.70个孩子和2.80个孩子。独生子女家庭中，较高比例是一男一女且男孩为长子；二孩家庭中，两个男孩的家庭比两个女孩的家庭更多。无论家庭规模、性别组合或排列如何，二孩（男-女顺序）家庭出现的频率都高于其他任何家庭。
