sex ratio
性别比率
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There was no difference in age distribution and sex ratio between the two groups.
两组间年龄分布和性别比率无差异。
·2,447,543篇论文数据，部分数据来源于NoteExpress
但如果只看第一胎的性别比率，“仅”为108，没有超出正常值太多。
But if you take first births alone, the ratio is "only" 108. That is outside the bounds of normality but not by much.
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