加的夫居民头胎婴儿的孕周和出生体重分布变化。
Changes in distribution of gestational age and birth weight among firstborn infants of Cardiff residents.
作者信息
Newcombe R, Chalmers I
出版信息
Br Med J. 1977 Oct 8;2(6092):925-6. doi: 10.1136/bmj.2.6092.925.
We studied data on firstborn singleton infants born to primiparous Cardiff residents during the decade 1965-1974. Both mean birth weight and gestational age at delivery fell appreciably during 1965-74. Changes in maternal age, height, smoking habits, or history of abortion did not explain these findings. The increased proportion of infants weighing less than 2500 g may be explained by the overall reduction in gestational age at delivery, which, in turn, may have resulted from increased use of elective delivery during the second quinquennium.
我们研究了1965年至1974年这十年间，卡迪夫初产妇所生头胎单胎婴儿的数据。在1965年至1974年期间，平均出生体重和分娩时的孕周均显著下降。产妇年龄、身高、吸烟习惯或流产史的变化并不能解释这些结果。出生体重低于2500克的婴儿比例增加，可能是由于分娩时孕周总体减少所致，而这反过来又可能是由于在第二个五年期间选择性分娩的使用增加所致。
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