前置胎盘与出生性别比
Placenta praevia and sex ratio at birth.
作者信息
MacGillivray I, Davey D, Isaacs S
出版信息
Br Med J (Clin Res Ed). 1986 Feb 8;292(6517):371-2. doi: 10.1136/bmj.292.6517.371.
The ratio of male to female sex among infants born to 391 women with and 114 079 without placenta praevia was analysed by parity. In the women without placenta praevia the sex ratio decreased significantly with increasing parity, whereas in the women with placenta praevia it increased. Overall, the sex ratio was increased among the women with placenta praevia, particularly multiparas. An increase in the sex ratio at birth is associated with insemination early or late in the menstrual cycle, which may result in delayed development and implantation of the blastocyst; this may be a predisposing factor in placenta praevia.
对391例前置胎盘孕妇和114079例无前置胎盘孕妇所生婴儿的男女比例按产次进行了分析。在无前置胎盘的孕妇中，男女比例随产次增加而显著下降，而在有前置胎盘的孕妇中则上升。总体而言，有前置胎盘的孕妇，尤其是经产妇，其男女比例有所增加。出生时男女比例的增加与月经周期早期或晚期授精有关，这可能导致囊胚发育和着床延迟；这可能是前置胎盘的一个诱发因素。
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