The sex ratio of human birth cohorts predicts the health and longevity of their members. Most literature invokes natural selection in support of the argument that heritable tendencies to produce male or female offspring induce oscillation in the sex ratio and its sequelae. Tests of the argument remain exceedingly rare because they require vital statistics describing many generations of a population both unaffected by migration and exposed to an exogenous stressor virulent enough to change the sex ratio at birth. We contribute to the literature by using time-series modeling to detect oscillation in the best data currently available for such a test.

中文翻译：

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人类第二性比振荡的测试

人类出生队列的性别比例可以预测其成员的健康和长寿。大多数文献引用自然选择来支持这样的论点，即产生雄性或雌性后代的遗传倾向会导致性别比例及其后遗症的波动。对这一论点的检验仍然非常罕见，因为它们需要生命统计数据来描述人口中的许多代人，这些人口既不受移民影响，又暴露于足以改变出生性别比的外源性压力源。我们通过使用时间序列建模来检测当前可用于此类测试的最佳数据中的振荡，从而为文献做出贡献。