White D R, Hall M H, Campbell D M
Br J Obstet Gynaecol. 1986 Jul;93(7):733-8.
Factors associated with spontaneous preterm birth were analysed in 254 primigravidae who gave birth to singleton infants between 28 and 36 completed weeks gestation in Aberdeen City District between 1978 and 1982. In 144 women labour followed premature rupture of the membranes and in 110 the membranes were intact and labour began with contractions. Among those with intact membranes, unmarried women and teenagers were over represented to a significant extent compared with all primigravidae. Among those with premature rupture of the membranes, the distribution of age and marital state was similar to that in all primigravidae, but the birthweight centile distribution showed a significant shift towards light-for-dates babies. It is argued that there may be two distinct categories of pregnancies that end in spontaneous preterm labour.
对1978年至1982年间在阿伯丁市辖区妊娠满28至36周分娩单胎婴儿的254名初产妇中与自然早产相关的因素进行了分析。144名妇女在胎膜早破后分娩，110名妇女胎膜完整，宫缩开始发动分娩。在胎膜完整的妇女中，未婚妇女和青少年的比例明显高于所有初产妇。在胎膜早破的妇女中，年龄和婚姻状况的分布与所有初产妇相似，但出生体重百分位数分布显示明显向小于孕周胎儿偏移。有人认为，可能存在两类不同的妊娠，最终导致自然早产。
