M&K Health Institute, 30-9 Kariya, Ako, Hyogo 678-0239, Japan.
M&K Health Institute, 30-9 Kariya, Ako, Hyogo 678-0239, Japan.
Early Hum Dev. 2020 Jan;140:104859. doi: 10.1016/j.earlhumdev.2019.104859. Epub 2019 Sep 4.
Stress due to earthquakes and other natural catastrophic events may result in a decline in the male to female ratio of newborn infants. One reason may be an increased death of male fetuses 3-5 months earlier. Another reason may relate to reduced conception of males and/or early male embryo demise 8-10 months earlier. Almost all of the earthquakes and natural catastrophic events have caused declines in sex ratios at birth except the Hurricane Katrina which showed a rise in the birth sex ratio. We describe hypothetical immunological cause for the decline in the sex ratio at birth following periods of augmented stress levels.
地震和其他自然灾害引起的压力可能导致新生儿的男女性别比例下降。原因之一可能是男性胎儿在怀孕 3-5 个月时的死亡率增加。另一个原因可能与男性受孕减少和/或 8-10 个月前男性胚胎早期死亡有关。除了卡特里娜飓风导致出生性别比例上升外，几乎所有的地震和自然灾害都会导致出生性别比例下降。我们描述了在压力水平升高期间出生性别比例下降的假设免疫原因。
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