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Gender imbalance may result in the threat of social unrest, especially in the case of an excess of low-status young males unable to find spouses, [61] and being recruited into the service of militaristic political factions. He considered the statistics of almost half a million births; the statistics showed an excess of boys compared to girls. Catalano notes that these trends may be related to the observed trend of elevated incidences of very low birth weight from maternal stress, during certain macroeconomic circumstances. For example, Ruder has studied 1. For example, the native population of Cusco, Peru at the time of the Spanish conquest was stressed by an imbalance in the sex ratio between men and women. These studies suggest that social factors such as early marriage and males siring their children young may play a role in raising birth sex ratios in certain societies.

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