Greenberg Mara B, Cheng Yvonne W, Sullivan Margaret, Norton Mary E, Hopkins Linda M, Caughey Aaron B
Department of Obstetrics, Gynecology and Reproductive Sciences, University of California-San Francisco, San Francisco, CA, USA.
Am J Obstet Gynecol. 2007 Oct;197(4):428.e1-7. doi: 10.1016/j.ajog.2007.06.058.
The purpose of this study was to examine lengths of first and second stages of labor across maternal age groups to determine whether different norms should be established.
We conducted a retrospective cohort study of all laboring, term, singleton, and cephalic deliveries at a single institution between 1980-2001. Median lengths of labor were compared among 6 maternal age groups. Statistical comparisons were made using Kruskal-Wallis and Wilcoxon rank sum tests. Multivariable linear and logistic regression models were performed.
Among 31,976 births, length of labor differed significantly by maternal age for both nulliparous and multiparous women. Younger nulliparous women (age, <20 yrs) had a shorter median second stage by up to 97 minutes (P < .001) than older nulliparous women (age, >39 yrs). After we controlled for potential confounders, we found that older women had a persistently higher likelihood of experiencing longer labor and prolonged labor than younger women.
Length of labor and prolonged labor increases with increasing maternal age.
本研究旨在探讨不同年龄组产妇第一产程和第二产程的时长，以确定是否应制定不同的标准。
我们对1980年至2001年间在某一机构进行分娩的所有足月、单胎、头位分娩产妇进行了一项回顾性队列研究。比较了6个产妇年龄组的分娩时长中位数。采用Kruskal-Wallis检验和Wilcoxon秩和检验进行统计学比较。构建了多变量线性和逻辑回归模型。
在31976例分娩中，初产妇和经产妇的分娩时长在不同年龄组间均存在显著差异。年龄小于20岁的初产妇第二产程中位数比年龄大于39岁的初产妇短97分钟（P <.001）。在控制了潜在混杂因素后，我们发现年龄较大的产妇比年轻产妇持续存在更长产程和产程延长的可能性更高。
产程时长和产程延长随产妇年龄增长而增加。
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